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Microsoft 365 sign-in screen appears blank when configuring a connection to Exchange Online

Problem: When configuring a connection to Microsoft 365 (Exchange Online) in CodeTwo backup or migration software, the Microsoft sign-in screen is not displayed correctly (blank screen is shown) and you cannot enter your credentials. Thi (ID:915)

How to generate a CSV file with PowerShell for CodeTwo migration tools

Problem: You would like to prepare a CSV file using PowerShell for importing matched source and target mailbox pairs into CodeTwo migration tools. Solution: To generate a CSV file containing the information required for mailbox mig (ID:906)

How to resolve an internal server error in CodeTwo Backup and CodeTwo Office 365 Migration

Problem: You are unable to restore or migrate data to the selected Microsoft 365 (Office 365) mailbox. You get the following error: An internal server error occurred. The operation failed. or Unable to upload item - [Item ID (ID:887)

How to check if my environment is hybrid?

Problem: You need to check if the environment you are working with is cloud-only, purely on-premises or if it implements any hybrid configuration. Solution: The hybrid environment in most cases refers to an Office 365 tenant perpet (ID:859)

How to fix Office 365 sign-in problem

Problem You are unable to sign in to Office 365 while configuring a connection in CodeTwo migration software. You get the following error when the Office 365 sign-in page opens in your browser: Stack overflow at line: 20 Solution (ID:847)

How to register CodeTwo applications in Azure AD

Problem: You want to manually register CodeTwo application in your Azure Active Directory tenant. Solution: CodeTwo Backup (starting version 2.3.x). CodeTwo Office 365 Migration / CodeTwo Exchange Migration (starting version 3.2.x) (ID:840)

Troubleshooting the ApplicationImpersonation role assignment

Problem: You want to configure a connection to Office 365 in your CodeTwo migration software; however, the following error message is displayed: Failed to assign role 'ApplicationImpersonation' to admin account The command you trie (ID:836)

How to troubleshoot being unable to match mailboxes for migration

Problem: You are unable to perform mailboxes matching when configuring a migration job in CodeTwo Office 365 Migration. You get the following error message: The type initializer for 'Microsoft.Online.Administration.Automation.Connec (ID:832)

Troubleshooting CodeTwo license status verification issue

Problem: When you start your CodeTwo product, access the licensing information or start a job, you get the following errors: Failed to verify the program license status. Check your internet connection and restart the program. Syste (ID:828)

How to fix problems related to remote PowerShell connections

Problem: Due to various PowerShell errors, you cannot configure a server connection to the target on-premises Exchange environment in your CodeTwo software. You may encounter one of the following errors: Connecting to remote server  (ID:824)

CodeTwo Reseller Panel: frequently asked questions (FAQ)

This article contains a list of questions frequently asked by CodeTwo partners and resellers. How to place an order? How can I calculate the product price? Can I order multiple products at the same time? Can I transfer a license (ID:810)

Public folders are not showing in CodeTwo migration software

Problem: Target public folders are not listed in CodeTwo migration software while configuring a migration job wizard. Solution: First, make sure that public folders actually exist on your target server. If not, follow these steps  (ID:809)

How to send files to CodeTwo Customer Support

Problem: You would like to send files (such as program logs, screenshots, emails, etc.) to CodeTwo for diagnostic purposes. Solution: To ensure maximum safety of your files and speed up our response, you should only send us files v (ID:802)

Troubleshooting impersonation rights error

Problem: When you are migrating mailboxes or running data backup or restore jobs by using CodeTwo software, you get the Failed mailbox message on the Bad news card with the following information: The account does not have permissi (ID:799)

Troubleshooting problems with unavailable Exchange Web Services

Problem: While using CodeTwo software, your migration or backup job fails with the following error message: Exchange Web Services are not currently available for this request because none of the Client Access Servers in the destinat (ID:797)

How to retain folder permissions after restoring/migrating public folders with CodeTwo software

Problem: You want to restore/migrate public folders to another Exchange environment by using CodeTwo Backup or CodeTwo migration software. At the same time, you want to keep the same folder permissions as configured on your source enviro (ID:780)

Error: The specified object was not found in the store

Problem: When using CodeTwo backup or migration software, you receive the following error: Error: The specified object was not found in the store. Can't connect to the mailbox of user Mailbox database guid: xxxxxxxx-xxxx-xxxx-xxxx-x (ID:779)

How to make sure older versions of CodeTwo migration software support TLS 1.2

This article relates only to older versions (2.x) of CodeTwo migration software. If you're using version 3.x of CodeTwo Exchange Migration / Office 365 Migration, see this article. Problem: Starting 31 October 2018, Microsoft makes TL (ID:766)

How to make sure CodeTwo migration software supports TLS 1.2

Problem: Starting 31 October 2018, Microsoft makes TLS 1.2 the default security protocol in Office 365. TLS 1.0 and 1.1 still work, but Microsoft does not provide support in case of connection or compatibility issues. This article exp (ID:763)

Troubleshooting CodeTwo certificate validation problems

Problem: You are unable to use or access key features of your CodeTwo product or even start the program itself. You receive one of the following messages: Failed to verify application certificates on this machine. or The li (ID:759)

How to manage mailboxes in Office 365 after migrating them within a hybrid environment

Problem: After you have migrated mailboxes within your hybrid environment with CodeTwo migration tools, you are unable to change some of the user settings in Office 365 – both via Windows PowerShell or Exchange admin center in Exchange (ID:750)

What happens to my emails after migration if the source and target domains are different

Problem: You've just completed the migration of mailboxes with CodeTwo migration tools and now you need to reply to emails and appointments. However, since the target domain is different from the source one, your replies are sent from  (ID:742)

How to migrate public folders from MDaemon Email Server with CodeTwo migration tools

Problem: You want to migrate mailboxes from MDaemon Email Server to your Exchange server or Office 365 with CodeTwo migration tools. However, by using the default MDaemon settings, public folders are migrated along with every mailbox, s (ID:727)

How to recreate Outlook profiles after the migration

Problem: After performing a migration that includes transferring the domain name to the target server, Outlook cannot connect to the new server. The following error message is shown: Outlook cannot log on. Verify you are connected t (ID:726)

Migrating default Outlook folders

Problem: You are migrating data between two environments that use different display languages, e.g. English is used on the source server and German on the target one. Once the migration finishes, you notice that the contents of the Inbox (ID:712)

How to fix problems related to the primary SMTP address in CodeTwo software

Problem: When using CodeTwo tools to migrate or back up your data, you receive the following error: The primary SMTP address must be specified when referencing a mailbox. Solution: When creating a new migration or backup job,  (ID:681)

How to check the location of an Office 365 tenant and Office 365 mailboxes

Problem: You would like to know the geolocation of your Office 365 tenant and what Microsoft datacenters host your Office 365 mailboxes. Solution: You can view the location of your Office 365 tenant in the Microsoft 365 admin cente (ID:669)

Corrupted emails after migrating from IMAP

Problem: You migrate emails from an IMAP server to a target on-premises Exchange server or Office 365 with CodeTwo migration tools. After the migration, your emails are empty, corrupted or lack formatting. Solution: Connect to your (ID:664)

Installing CodeTwo products on Windows Server 2016

Problem: After a successful installation of CodeTwo software (listed in the Applies to section on the right) on Windows Server 2016, you cannot launch the program from the Start menu. It’s not possible to expand the CodeTwo folder that (ID:661)

How to grant full access control to public folders

Problem: You have insufficient access rights to migrate or back up public folders with CodeTwo software. Solution: The admin account used in CodeTwo software to connect to the source server needs to be manually granted the Full con (ID:658)

How to manually assign management roles

Problem: You want to assign only the minimum required management roles to the admin account used to connect to your Exchange on-prem environment. Solution: Since CodeTwo migration tools use the Role Based Access Control (RBAC) perm (ID:654)

How to migrate your autocomplete cache

Problem: You would like to migrate the autocomplete cache from your old Outlook to a newer version of the software. Solution: Microsoft Outlook is equipped with a mechanism that helps you fill the To, Cc and Bcc fields by sugg (ID:603)

How to allow PowerShell to connect to Exchange Server over IP address

Problem: You need to be able to connect with PowerShell to your on-premises Exchange Server by using its IP address instead of its FQDN or hostname. Solution: In order to allow PowerShell to connect remotely over an IP address, Po (ID:601)

How to fix problems with verification of group membership

Problem: You are unable to configure the source server connection, because CodeTwo migration software cannot verify the membership of a chosen user. Fig. 1. Problems with verification of group membership. Solution: This error (ID:579)

Enable WCF Tracing

Problem: You would like to enable tracing of any WCF service or application, for diagnostic purposes. Solution: Every WCF service and application comes with its own CONFIG file. The CONFIG files are located in the same director (ID:553)

How to exclude a public folder from migration

Problem: You would like to exclude a specific public folder from migration when using CodeTwo Exchange Migration or CodeTwo Office 365 Migration. Solution: Unfortunately, there is no such option in CodeTwo migration software that w (ID:544)

How to export a list of mailboxes to a CSV file

Problem: You need to export a list of mailboxes from an on-premises Exchange server or Exchange Online (Office 365) to a CSV file, for example, to use it with CodeTwo migration software. Solution: There are two ways to prepare a CS (ID:525)

How to set up DNS records properly for a migration

Problem: How to set up DNS records for a source and target domains, to make the cross-domain migration flawless. Solution: Please be aware that steps below are for cross-domain migration and assume both domains should be resolvable (ID:524)

Failed to find an exchange connection for selected mailbox

Problem: The program is unable to migrate your mailboxes and you are receiving the following error during the migration: Failed to find an exchange connection for selected mailbox. Solution: This error may be caused by the f (ID:523)

Missing MAPI profile

Problem: You have created a MAPI profile but cannot see it e.g. in MFCMAPI. Solution: MAPI profiles are visible only to users for which they were created. If you created a MAPI profile for a mailbox of, let us say User-A, its MAP (ID:522)

Troubleshooting mailbox migration problems caused by MAPI limits

Problem: You are unable to continue the migration due to various errors related to exceeding default MAPI limits. After some time, mailboxes are starting to fail, showing the Error state. In the log files you may find the below errors:  (ID:516)

How to fix problems with migration of public folders caused by insufficient permissions

Problem: Migration of public folders is not possible due to insufficient permissions. When trying to process public folders, the program is reporting the following (or similar) errors: Unable to upload this item: - . MAPI function  (ID:510)

Prepare AD sync tools for migration to Office 365 via CodeTwo software

Problem: If you are working with AD synchronization tools (e.g. Azure Active Directory Connect) in an Exchange hybrid environment, there is a high probability that you applied a default configuration for the synchronization process. If  (ID:509)

Failed to configure MAPI profile

Problem: You are unable to configure source Server connection due to a window pop-up error: Failed to connect to Exchange Server using account . Failed to configure MAPI profile. Also, MAPI Service log files contain the following (ID:506)

Error related to deserializing object graph

Problem: The following error occurs in one of the WCF services used by CodeTwo software: The InnerException message was 'Maximum number of items that can be serialized or deserialized in an object graph is '65536'.  This problem (ID:498)

Error opening default folder (MAPI-E-INVALID-ENTRYID)

Problem: While using CodeTwo Migration software, you are encountering the following error, regarding processing default folders of particular mailboxes: Error opening default folder. Invalid object entry id (MAPI_E_INVALID_ENTRYID) (ID:494)

Extended RPC logging on Exchange Server

Problem: How to extend Exchange Server RPC log files. Solution: To extend the Exchange Server RPC logging do the following steps: Locate folder named: %ExchangeInstallPath%\Bin or in the case of Exchange 2016 and Exc (ID:484)

How to fix problems with the migration of public folders (quota exceeded)

Problem: Your migration process cannot be completed, and you see the following error messages in the program's log files: Error while uploading package. System.Exception: [ErrorQuotaExceeded] - Mailbox has exceeded maximum mailbox  (ID:483)

Not enough storage is available to process this command

Problem: When trying to install CodeTwo software on Microsoft Small Business Server 2008 you get an error window with the following message: Not enough storage is available to process this command. Fig. 1. The error message.  (ID:471)

The request failed. The remote server returned an error: (405) Method Not Allowed

Problem: You get the following error in CodeTwo Office 365 Migration: The request failed. The remote server returned an error: (405) Method Not Allowed Solution: If you have a hybrid environment (on-premises Exchange server  (ID:466)

Invalid mime content

Problem: During the migration with CodeTwo Exchange Migration or CodeTwo Office 365 Migration some items are not migrated and one of the following errors is recorded for them in the log files: Error while uploading package. Sys (ID:451)

Finding large items in Exchange mailboxes

Problem: You want to find and list the largest items in Exchange mailboxes. Solution: This article helps you list the largest items in mailboxes. This knowledge can be useful in various circumstances. For example, you want to m (ID:440)

How to find the EWS URL and how to test it

Problem: You want to know the URL of Exchange Web Services (EWS). Solution: Finding the EWS URL on a client access server Finding the EWS URL by using the configuration of Web Services Virtual Directory Testing the EWS URL  (ID:429)

Error opening default mailbox in the MAPI profile

Problem: You get the following or similar error messages in either a window pop-up, software's log files or in the status window: Error opening default mailbox in the MAPI profile. MAPI_E_FAILONEPROVIDER (0x8004011d) or MAPI_E_UNCO (ID:414)

Error: MAPI logon failed (MAPI_E_LOGON_FAILED) (0x80040111)

Problem: You are able to migrate particular number of mailboxes (for example 20) with CodeTwo Exchange Migration or CodeTwo Office 365 Migration but after reaching that number further mailboxes are not migrated and the following erro (ID:412)

Error: [ErrorNonExistentMailbox]

Problem: You get the following error in CodeTwo Exchange Migration or CodeTwo Office 365 Migration: [ErrorNonExistentMailbox] - The SMTP address has no mailbox associated with it. Solution: The target mailbox is not fully e (ID:411)

Target server mailbox addresses are not resolving

Problem: Target server mailbox addresses are not resolving in CodeTwo Exchange Migration or CodeTwo Office 365 Migration. Solution: In some migration scenarios such as a cross-domain migration the target server email addresses do  (ID:394)

How to migrate room and equipment mailboxes

Problem: Resource mailboxes, such as rooms and equipment, are not listed in CodeTwo Office 365 Migration and CodeTwo Exchange Migration, so they cannot be migrated to any server. Solution: Although the migration of resource mailbox (ID:391)

MAPI_E_AMBIGUOUS_RECIP (0x80040700)

Problem: When using CodeTwo software that utilizes MAPI profiles to access mailboxes you receive MAPI error MAPI_E_AMBIGUOUS_RECIP (0x80040700). The error message is either displayed in a window or visible in the software's log file.  (ID:380)

Free/Busy status migration

Problem: Does CodeTwo Exchange Migration or CodeTwo Office 365 Migration software migrate Free/Busy status? Solution: The Free/busy info is a feature of MS Exchange Server provided by Availability Service. This is not something  (ID:354)

How to connect to an Exchange server via PowerShell

Problem: You want to set up a remote session to an Exchange server via PowerShell. Solution: This article will help you: connect to your on-premises Exchange servers via remote PowerShell session create a remote PowerShel (ID:350)

How to delete the contents of a user mailbox

Problem: You would like to delete the contents of a user's mailbox in Exchange Server or Exchange Online (Office 365). Solution: In Exchange Server 2019, 2016, 2013, 2010 or Exchange Online (Office 365), you can use PowerShell (ID:349)

Does CodeTwo migration software support delta pass migrations?

Problem: Does CodeTwo Exchange Migration or CodeTwo Office 365 Migration support "delta pass" migrations? Solution: Our migration software has a built-in feature that checks if an already migrated mailbox received any new items (ID:333)

Diagnosing CodeTwo migration software

Problem: CodeTwo assistance is required when you experience problems with CodeTwo Exchange Migration / CodeTwo Office 365 Migration or require advanced configuration of the software. You need to provide a description of your environment  (ID:307)

How to create public folders in Microsoft Exchange and Office 365

Problem: You need to manually enable public folders in Exchange Server 2010, 2013, 2016, 2019 or Exchange Online (Office 365). Solution: To enable public folders, you have to create an empty public folder tree. If you are using Cod (ID:289)

How to set up IIS for CodeTwo Exchange Sync and CodeTwo migration software

Problem: You get one of the pop-up windows shown below or you know for sure that your IIS settings have been modified. Fig. 1. A window that pops up if SSL or Windows authentication in IIS are not set up properly. Fig. 2. A  (ID:287)

Troubleshooting CodeTwo migration software

The first thing for you to do when troubleshooting the CodeTwo Exchange Migration and CodeTwo Office 365 Migration software is to make sure that the program was installed and configured properly and your environment is prepared for migratio (ID:286)

How to set impersonation rights manually

Problem: How to manually manage impersonation rights for an administrator account. Solution: Use the links below to learn how to add impersonation rights to your admin account via: PowerShell Exchange admin center (applies (ID:285)

Changing message size limits

Problem: You would like to change the message size limit, set on your target Exchange Server. This may be helpful when uploading large items via Exchange Web Services (EWS). EWS is used by selected CodeTwo products such as migration or b (ID:284)

How the Exchange throttling policy impacts CodeTwo software

This article discusses the concept of throttling and how the Exchange throttling policy affects the performance of CodeTwo software. In addition, it provides instructions on how to manage throttling policies in Exchange. What is throttli (ID:283)

How to find the license key in CodeTwo software

Problem: You need to find the license key for your CodeTwo software. Solution: CodeTwo applications are activated to the full version by entering a 25-character license key that you receive once the order is paid for. Finding th (ID:167)

Overview

CodeTwo Office 365 Migration lets you migrate your company's mailboxes and public folders located in Office 365 or on on-premises Exchange Servers (all versions are supported) to Office 365 (Microsoft 365). It allows you to migrate ema

Troubleshooting server connection

If you configure the EWS connection to a source Exchange Server, the first action (test) performed by the program is always Check connection to Exchange Server, as shown in Fig. 1. below. During this operation, the software tries to a

Migration walkthrough

The documentation presented here applies to specific migration types and will guide through the whole process form A to Z. In this section, we explain the preparation of the environment for migration, provide the steps for successful pla

Supported platforms and system requirements

The tables below show the program's requirements, necessary for its proper operation, and the list of supported platforms. Software components The program consists of two main components: CodeTwo Office

Migration from Exchange Server to Office 365

I. Pre-migration activities Before you install and configure CodeTwo Office 365 Migration, make sure that your environment (both the source and target server) is prepared for migration and that you meet the system requirements. Be

Activation

You need to activate CodeTwo Office 365 Migration after the trial license has expired. Follow the links below to learn how to: Activate the program for the first time Activate the program after an upgrade Update the number of avai

Migration types

CodeTwo migration software supports most common migration types: cutover, staged and hybrid. Simply configure the migration job accordingly, and the program will do the rest for you. In case you're not sure which type is best suited for y

Reports

The Reports feature allows you to track the progress of your migrations. To create a new, up-to-date report of the desired range, use the Reports section (Fig. 1.) on the ribbon, available on the Jobs tab. The program allows you genera

Migration between two Office 365 tenants

I. Pre-migration activities Before you install and configure CodeTwo Office 365 Migration, make sure that your environment (both the source and target server) is prepared for migration and that you meet the system requirements. Be

Hybrid migration

A hybrid environment is where your on-premises Exchange server is synced with Office 365. CodeTwo migration software can be successfully used for scenarios that involve migrating data from or to such an environment. What is a hybrid m

Configuring a migration job

This article describes how to configure a migration job step by step. A simple wizard will help you define all crucial aspects of the migration, for example selecting a target server, range of mailboxes and necessary time and folder filters

Licensing

The licensing model of CodeTwo Office 365 Migration is based on the total number of source mailboxes that will be migrated. Each migrated mailbox consumes one license. Regardless of the number of licenses that you purchased, you will only r

Troubleshooting application authentication

When configuring a connection to Office 365, the program attempts to authenticate itself with your Azure Active Directory. If it fails to do so, you will receive the following notification (Fig. 1.): Fig. 1. Failure to authenticate C

Connecting to a source IMAP server

Once the installation of CodeTwo Office 365 Migration is finished, you have to choose a source environment from which the data will be pulled and migrated to selected mailboxes in target Office 365. This article describes how to connect to

Cutover migration

In this article, you will learn about what the cutover migration is, how to perform it in CodeTwo Office 365 Migration, and what are the most common use cases for this migration type. What is a cutover migration? How to perform the

Installation overview

This section includes essential information regarding the installation of the program in your environment. Navigate through the articles listed below and learn how to: Install the program Update or upgrade and what is the differe

How to

This section includes step-by-step instructions on how to configure and start a migration job. Before rushing to migration, make sure that you understand how the software works, your environment meets all the requirements, and the softwar

Additional configuration information

CodeTwo Office 365 Migration offers additional options that improve the migration process and let you take control of the mailbox items that will be migrated. These options are available as steps in the migration job wizard or the server c

Migration from IMAP source to Office 365

I. Pre-migration activities Before you install and configure CodeTwo Office 365 Migration, make sure that your environment (both the source and target server) is prepared for migration and that you meet the system requirements. Be

Connecting to a source on-premises Exchange server

Once the installation of CodeTwo Office 365 Migration is finished, you have to choose a source environment from which the data will be pulled and migrated to selected mailboxes on target Office 365 tenant. This article describes how to co

Connecting to target Office 365

Once you installed CodeTwo Office 365 Migration and configured a source environment, it is time to create a connection to your target Office 365 tenant. To configure a target connection, you need to launch the Target server connection

Installation process

Before installing CodeTwo Office 365 Migration, you need to decide on which machine you want to install it. The main factor you should take into consideration is your migration source. In migrations from on-premises Exchange Server, the

Matching mailboxes

For the migration to occur, each source mailbox needs to be paired with a target mailbox. The purpose of the matching process is to create associations between source and target mailboxes. The matching process takes place in the Match ma

Staged migration

This article describes how to use CodeTwo Office 365 Migration to migrate all your data in two stages. Use the links below to learn more about: characteristic features of the staged migration how to perform the staged migration 

Troubleshooting

The most common errors that you might encounter when using CodeTwo Office 365 Migration depend on your connection method. Use the links below to learn more. Troubleshooting EWS connectivity (Exchange Server & Office 365) Troublesh

Migration

CodeTwo Office 365 Migration is a tool designed to migrate source mailboxes and public folders to the chosen target location. Unlike another software of this kind, this program performs the simplified migration, which doesn't need any extra

First steps

First time using the program? Here are some useful links: Supported platforms and requirements – see the technical specifications required to use the software. Installation process – find out how to install CodeTwo Office 365 Mi

Connecting to source Office 365

Once the installation of CodeTwo Office 365 Migration is finished, you need to choose a source environment from which the data will be pulled and migrated to selected mailboxes in target Office 365. This article describes how to connect to

Migration speed

In certain situations, users might notice that process of both gathering and uploading data takes longer than expected considering the network bandwidth. Multiple factors may impact speed of the migration. Where to install First of al

Troubleshooting EWS connectivity (Office 365)

CodeTwo Office 365 Migration attempts to connect to EWS (Exchange Web Services) during the Configuration step of the source/target server connection wizard. If the connection cannot be established, you will get the following error message:

Troubleshooting application registration

If you choose the Automatic registration option when configuring a source or target Office 365 connection in the program, the connection wizard attempts to register CodeTwo Office 365 Migration in your Azure Active Directory. If the attem

Log files

CodeTwo Office 365 Migration generates various diagnostic data for all its components. All this data is kept together within the software's subfolder in the %ProgramData% folder along with some configuration and statistics files. Sendi

Dashboard and Jobs

The Administration Panel of CodeTwo Office 365 Migration consists of the following tabs: Dashboard - allows you to get a basic overview of the program status. You can check the progress of your migrations, activate the program or ve

Trial version

The trial version of CodeTwo Office 365 Migration works for 30 days for an unlimited number of mailboxes. However, you can only migrate up to 10 items of any type (emails, contacts, tasks, meetings etc.) from each mailbox, including public

IMAP source connectivity

While configuring an IMAP connection, the application attempts to contact the desired server using IMAP protocol. To connect properly to an IMAP server, the program needs the following information: Host name, provided either as an IP

Management roles

CodeTwo Office 365 Migration takes advantage of the Role Based Access Control (RBAC) permission model to connect to on-premises Exchange server via EWS. RBAC enables assigning different roles to users in order to maintain their access right

Feedback

Your feedback is very important to us. It has continuously helped us develop better applications and we strongly encourage you to send us your concerns and suggestions about new and existing features. Your opinion shapes new functionalitie

Troubleshooting source Exchange Server connectivity

This article describes the Check connection to Exchange Server action of the source connection wizard. When this action is performed, the program uses the administrator account (provided in the previous step of the wizard) to create a MAPI

Additional migration options for mailboxes

The program offers some additional migration settings for individual mailboxes. To access them, open the JOBS tab and select a migration job from the menu on the left. Choose any mailbox from the list (Fig. 1.) and right-click it to see t

Delta migration explained

After you configure and start a migration job, CodeTwo Office 365 Migration performs a full migration of the selected data from the source server to the target one. Once the full migration is finished, you can use the Rescan feature that sc

How to update or upgrade and what is the difference

The version number The program version is always visible at the very top of the main window of the program. It consists of 4 numbers separated by dots, e.g. 3.0.0.337, following the pattern below: [major].[minor].[maintenance].[build]

Understanding CodeTwo Office 365 Migration

The articles below include conceptual descriptions of all features of the program. It is recommended that you familiarize yourself with them so you know the software mechanics and the idea our developers had in mind when creating it. By

Managing server connections

Once you have configured the connection to your source and target environment, these connections will be shown on the Administration Panel's Dashboard tab, on the Defined source server connections or Defined target server connections cards,

Upgrade to version 3.x

The upgrade is free of charge for all clients who already own a valid license key for version 2.x. or 1.x.  New clients are welcome to purchase a license key on the product’s website. Important The license key version needs to

EWS source/target connectivity

Exchange Web Services (EWS) are used by the program to connect to source Exchange Server - this method should be used for connections to Exchange 2010 with SP1 or later (for connections to Exchange versions earlier than 2010 SP1, MAPI pro

Office 365 connectivity

To connect with Office 365, CodeTwo Office 365 Migration needs to be registered in the Azure AD of each tenant that is used in the migration process. Once registered, the application uses Microsoft Graph and Exchange Web Services to access

Troubleshooting ApplicationImpersonation role assignment

When configuring the connection to a source on-premises Exchange server, the connection wizard checks if the provided admin account is assigned the ApplicationImpersonation role. If the role is missing, the Configuration step fails (Fig. 1

How to uninstall CodeTwo Office 365 Migration

To uninstall CodeTwo Office 365 Migration from your machine, follow these steps:  Open Control Panel in Windows. Click (Programs >) Programs and Features. Find CodeTwo Office 365 Migration on the list, right-click it and select

Refresh email addresses

To perform a successful migration with CodeTwo Exchange / Office 365 Migration you need to, at least, connect to your source and target servers, select mailboxes that you want to migrate and match them with mailboxes residing on your target

Scheduler

The scheduler feature (Fig. 1.) allows you to set the time frames for the migration. With this feature, you can plan the migration ahead and choose the most convenient times for running the migration job. Since migration is often extremely

Monitoring and diagnostics

CodeTwo Office 365 Migration provides multiple ways of monitoring the software state, behavior and diagnosing problems: Dashboard and Jobs - the Administration Panel, which consists of Dashboard and Jobs tabs, serves as command and co

Program's components

CodeTwo Office 365 Migration consists of the following components: Data Provider Service and Administration Panel. To provide you with maximum safety, there are no CodeTwo agents on the intermediary, third-party servers. CodeTwo Office

Troubleshooting View-Only Configuration role assignment

When configuring the connection to a source on-premises Exchange server, the connection wizard checks if the provided admin account is assigned the View-Only Configuration role. If the role is missing, the Configuration step fails (Fig. 1.)

Troubleshooting Data Provider service configuration

This article describes the Configure data provider service action of the source MAPI connection wizard. When this action is performed, the program configures the Data Provider Service. The service uses the MAPI profile of the defined adm

Reinstall or move to a different machine

Sometimes you may need to reinstall the program or even to move it to a different computer. See below how to do that. Reinstallation Reinstallation of the software is rarely required. However, it may happen that it will be recommende

MAPI source connectivity

MAPI is one of the available methods of connecting to a source Exchange server. You need to choose the MAPI protocol if you connect to Exchange 2003, 2007 or 2010 without SP1. Important The program currently allows creating only o

Troubleshooting Graph API connectivity

This article covers the most common errors related to Graph API connectivity.  Code: Authorization_RequestDenied Message: Insufficient privileges to complete the operation. CodeTwo Office 365 Migration doesn't have the necessary p

Troubleshooting the source Exchange Server administrator's group membership

This article describes the Check group membership action of the source MAPI connection wizard. When this action is performed, the program checks if the administrator (provided in the previous step of the wizard) is a member of a required gr

Why do I need this program?

Using CodeTwo Office 365 Migration you will significantly reduce the time required to successfully move mailboxes from on-premises Exchange servers or email from IMAP servers to Office 365 (Microsoft 365). The program also lets you migrate data between two Office 365 tenants. The main benefits of this migration tool include:

  • Easy-to-use graphical interface that minimizes the need for PowerShell scripts.
  • Direct mailbox migrations from any Exchange edition (including 2003) to Office 365, which eliminates the need for upgrades, hybrid deployments, etc.
  • Migrations between Office 365 tenants.
  • Enhanced IMAP migrations to Office 365. Learn more...
  • Convenient reporting features that facilitate troubleshooting.

See a full comparison of CodeTwo Office 365 Migration and Office 365 native migration tools.

Is there a free trial? What are the limitations?

Yes, there is. You can download the free trial version here.

The trial works for 30 days and allows you to migrate up to 10 items per folder (after you switch to the full version, CodeTwo Office 365 Migration will migrate the remaining items). Other than that, it has all the features of the full version of the program.

How does the CodeTwo Office 365 Migration solution work?

Migrations from Exchange Server are achieved by connecting to source server(s) via a dedicated MAPI profile or Exchange Web Services (EWS), depending on the source server, and to the destination server(s) via EWS. This way, CodeTwo Office 365 Migration can read the contents of mailboxes on your source server and copy them to mailboxes in Exchange Online.

Connection to Office 365 (Microsoft 365) is done via the OAuth 2.0 authorization protocol to provide maximum security. During the connection setup, the program is registered in the Azure Active Directory of each tenant that is used in the migration process. The registration process is completely automated by the program, but you can perform the registration manually as well. Learn more…

To perform migrations via IMAP, the application connects to source server accounts similarly to an email client (source account credentials are required) and copies emails to target server mailboxes. Learn more about IMAP migrations...

All you have to do to perform the migration is create target mailboxes (or configure CodeTwo Office 365 Migration to create and activate mailboxes for you).

Learn more about how the program operates

Can I migrate mailboxes between two different Office 365/Microsoft 365 tenants?

Yes, you can. CodeTwo Office 365 Migration enables an easy migration from one Office 365 (Microsoft 365) tenant to another, which can come in handy e.g. in the case of company mergers or acquisitions. Learn more...

Are migrations from IMAP servers supported?

Yes, using CodeTwo Office 365 Migration you can replicate email from servers such as Google Workspace (G Suite), Zarafa, Zimbra, HCL Notes (formerly IBM Notes and Lotus Notes), Kerio Connect, etc., to Exchange Online. The application lets you customize and manage more aspects of IMAP migrations than by using Microsoft's native tools. Learn more...

There are several limitations related to using the IMAP protocol. The migrations are limited to email folders only and you need to provide credentials to all user accounts that will be migrated. To learn more about IMAP migrations, go to this user's manual page.

Are migrations from hosted Exchange supported?

Yes, provided that IMAP4 is enabled on the source Exchange Server.

Thanks to IMAP migration, you can migrate emails from hosted (e.g. Rackspace) or other limited-access Exchange servers. Learn more...

Can the program migrate encrypted emails?

The program can migrate encrypted emails, but they will be moved as regular emails, so they will not be encrypted on the target server. The encryption configuration is not migrated, and it needs to be set up once migration is finished. The contents of emails recreated on the destination server will be the same as those of emails on the source server.

Does CodeTwo Office 365 Migration support organizations synced using Azure AD Connect or other directory sync tools?

Yes, the software supports migration from and to a hybrid environment. Learn more...

Can the program migrate all languages?

Yes. Content language does not affect the migration process. CodeTwo Office 365 Migration can move any item that contains special characters, regardless of the language set on the source and target server. Learn more in the user’s manual...

What type of support do you offer for the product?

Technical support for CodeTwo Office 365 Migration is free of charge and covers all types of issues. You can contact our technicians via email or phone, 24 hours a day, from Monday through Friday (find out more about CodeTwo support). Complex issues are resolved via remote sessions.

All technical documentation for CodeTwo Office 365 Migration is available online:

What is CodeTwo Office 365 Migration's licensing policy?

The product is licensed through use. Each mailbox you start migrating automatically uses up 1 seat from your license pool. In addition, the program consumes 25 licenses to migrate public folders (regardless of their size).

In other words, if you had a 100-mailbox license and started migrating 60 mailboxes, your license would still allow you to migrate, for example, 40 mailboxes (or 15 mailboxes and public folders) to Office 365 (Microsoft 365).

What is more, the licensing model lets you install the software in any number of source environments. If you use the same license key, each migrated mailbox subtracts from the same, common license pool. This means that a single mailbox will not consume more than one license.

More CodeTwo Office 365 Migration licensing details (user's manual)

What if I already have a license and need extra seats?

You can purchase extra seats by going to the online order formselecting Additional licenses and proceeding to complete the order.

NOTE: In the 2nd step of the online order form, you will be asked to provide the license key that you wish to expand.

If you received your CodeTwo Office 365 Migration license free of charge and now want to add seats to it, please contact our sales team for assistance.

What type of data can be migrated?

To learn more on what type of data is supported for migration, see this user's manual article.

Do I have to install the program on a server?

No, you don't. You can install CodeTwo Office 365 Migration on any machine (server or client) connected to the source organization if you plan to migrate from on-premises Exchange server or on any machine (including a cloud-hosted virtual machine, like Microsoft Azure Virtual Machine) for tenant to tenant migrations, as long as that machine is connected to the Internet and can reach Office 365 (Microsoft 365).

More CodeTwo Office 365 Migration installation details (user's manual)

What is the migration speed? Does CodeTwo Office 365 Migration impose any size or speed limits?

No, our software does not introduce any new limits when migrating data to Exchange Online. The migration speed via EWS, as observed by Microsoft, is between 0.2 and 0.5 GB per hour

Keep in mind that Office 365 (Microsoft 365) comes with a number of built-in limitations for EWS migrations. The main ones are:

  • 25 MB per-item limit – this means that items larger than 25 MB will be skipped during a migration. However, you can change this limit up to 150 MB – learn more in this Knowledge Base article.
  • Resource health-based throttling – present in cases of service availability issues.

Other factors that may affect the migration performance are:

  • Source and target server throttling policies and limitations.
  • Data type and density (e.g. a mailbox with a smaller number of large items will migrate faster than one with a larger number of small items).
  • Migration server hardware.
  • Network infrastructure.

For more, consult this Microsoft article.

CodeTwo Office 365 Migration does not increase or decrease the standard speed of an EWS migration. However, it is possible to achieve higher migration speeds by:

See this user’s manual article to learn more about how to speed up the migration process.

How do I prepare for the migration?

For details on migration requirements and pre-migration steps go to this user's manual page and choose your migration scenario.

Does CodeTwo Office 365 Migration support multi-factor authentication?

Yes, CodeTwo Office 365 Migration supports multi-factor authentication enabled on Office 365 (Microsoft 365) accounts.

Does CodeTwo Office 365 Migration automatically create target users and mailboxes?

Yes, it does. The process is performed based on source server’s user data and can be fully customized. Learn more...

Can I define criteria based on which source and target mailboxes will be auto-matched?

Yes, you can. Apart from using predefined matching patterns, you can also create your own. Learn more...

Does CodeTwo Office 365 Migration migrate public folders?

Yes, it does. The migration mechanism is exactly the same as in the case of personal mailboxes: our software replicates the public folder structure and contents from the source server in the target Office 365 (Microsoft 365) tenant. However, since public folders cannot exist in Office 365 and in on-premises Exchange server simultaneously, migrating them within hybrid environments is not possible.

NOTE: To migrate public folders, you first need to create them in Office 365. Additionally, the admin account used in the program to configure the target Office 365 connection needs to be assigned the Owner permission level to the root public folder on that tenant and to all subfolders to which you plan to migrate your data. Also bear in mind that migrating public folders reduces your CodeTwo Office 365 Migration license by 25 users.

Is the free/busy info migrated as well?

Free/busy statuses are generated on the fly by the Exchange Availability Service based on users' calendar information. This means that after CodeTwo Office 365 Migration copies your users' calendars to Exchange Online, the Office 365 (Microsoft 365) engine will take care of the rest and set the appropriate status.

Does CodeTwo Office 365 Migration affect data on the source server?

No, it doesn't. The application only reads source server data and copies it to your Office 365 (Microsoft 365) organization – nothing is deleted from or modified on your source server.

I want my users to still use source mailboxes after they have been migrated - can they do that?

Yes, they can. The contents of the source mailboxes are not affected in any way, so your users can use these mailboxes indefinitely without any limitations.

What is more, once you decide to retire your source server and move to the target one, use the Rescan feature in CodeTwo Office 365 Migration. This will restart your migration job, but the program will copy only those items that have been created on the source server after the initial migration.

What do I do if I get an error...?

Consult this Knowledge Base article for troubleshooting steps.

If none of the suggestions from the article help, contact our Technical Support team.

For general technical information about CodeTwo Office 365 Migration, refer to the user's manual.

Answers to common queries can be found in the Knowledge Base.

How to upgrade to version 3.0?

To upgrade CodeTwo Office 365 Migration to version 3.0, you need to follow the steps specified in this article.