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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 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 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)

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)

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)

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)

Creating new AD users in a specific organizational unit

Problem: You want CodeTwo migration software to create mailbox-enabled users in a specific organizational unit (OU) within your Active Directory. Solution: By default, new Active Directory users are put in the Users container (CN (ID:729)

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)

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)

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)

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)

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 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)

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)

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)

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)

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)

Troubleshooting server connection

If you configure the EWS connection to a source/target 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 t


CodeTwo Exchange Migration lets you migrate your company's mailboxes and public folders located on on-premises Exchange servers (all versions are supported) or in Office 365 / Office 365 Germany. The program works equally great for m

Migration walkthrough

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

Cross-forest migration from Exchange 2010 to Exchange 2019/2016/2013

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

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 Exchang

Connecting to a source IMAP server

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

Additional configuration information

CodeTwo Exchange 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 con

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


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

Cross-forest migration from Exchange 2013 to Exchange 2019/2016

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

Cutover migration

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

Connecting to a source on-premises Exchange server

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

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

Staged migration

This article describes how to use CodeTwo Exchange 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  us

Configuring a migration job

After you have defined the source connection, you can continue to configure a migration job. A simple wizard will help you define all crucial aspects of the migration, for example selecting a target server, range of mailboxes and necessa

Dashboard and Jobs

The Administration Panel of CodeTwo Exchange 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 verif

Connecting to a target Exchange server

Once you installed CodeTwo Exchange Migration and configured a source environment, it is time to create a connection to your target Exchange server. Info The program uses Exchange Web Services (EWS) to connect to a target Microsof

Installation process

Before installing CodeTwo Exchange 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 p

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

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

Migration from IMAP source to Exchange 2019/2016/2013

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


The licensing model of CodeTwo Exchange 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 rec

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 a


You need to activate CodeTwo Exchange 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 availa

Cross-forest migration from Exchange 2007 to Exchange 2019/2016/2013

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


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 t

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


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 generat

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

Management roles

CodeTwo Exchange Migration takes advantage of the Role Based Access Control (RBAC) permission model to connect to both source and target on-premises Exchange servers via EWS. RBAC enables assigning different roles to users in order to maint

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

Cross-forest migration from Exchange 2003 to Exchange 2019/2016/2013

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

Cross-forest migration from Office 365 to Exchange 2019/2016

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

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, M

Connecting to source Office 365

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

Target Exchange server's name vs. its IP address

On the first screen of the Target server connection wizard, you can decide to configure the connection manually. In such a case, we recommend using the name of the server instead of its IP. If, however, you need to use the IP address of th

Delta migration explained

After you configure and start a migration job, CodeTwo Exchange 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 scan

Troubleshooting View-Only Configuration role assignment

When configuring the connection to 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.), as the

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 Exchange Migration doesn't have the necessary per


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

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

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., following the pattern below: [major].[minor].[maintenance].[build]

Log files

CodeTwo Exchange 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. Sending

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

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

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 Exchange Migr

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,

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.

Troubleshooting Public Folders migration

When configuring the connection to a target server, the connection wizard checks if the provided admin account is assigned the Public Folders role. If the role is missing, you receive a warning message. The text of the warning message, as

Troubleshooting EWS connectivity (Office 365)

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

Troubleshooting View-Only Recipients role assignment

When configuring the connection to a target server, the connection wizard checks if the provided admin account is assigned the View-Only Recipients role. If the role is missing, the Configuration step fails (Fig. 1.), as the program is not

Understanding CodeTwo Exchange 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. B

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

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

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 application registration

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

Program's components

CodeTwo Exchange 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 Exchange M

Trial version

The trial version of CodeTwo Exchange 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 fo

How to uninstall CodeTwo Exchange Migration

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

Office 365 connectivity

To connect with Office 365, CodeTwo Exchange 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 ma

Refreshing email addresses

To perform a successful migration with CodeTwo Exchange 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 server. However, each

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

Monitoring and diagnostics

CodeTwo Exchange 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

Troubleshooting permission to create new mailboxes

When configuring the connection to a target server, the connection wizard checks if the provided admin account is assigned the Mail Recipient Creation and Mail Recipients roles. If they are missing, the following warning messages are shown

Cross-forest migration from Exchange 2016 to Exchange 2019/2016

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


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

Why do I need this product?

CodeTwo Exchange Migration takes the most grueling part of a server migration or upgrade – the move of users’ mailboxes and public folders – off your back. A configuration wizard guides you smoothly through the migration job setup and the Automatch feature pairs source and target mailboxes. After these steps, simply click Start and the program automatically performs a direct migration of the mailboxes you selected to the target environment (without deleting items on the source server side).

Our biggest advantages over the competition or tools provided by Microsoft are:

  • direct migrations from any Exchange Server (including Small Business Servers) to Exchange 2019, 2016, 2013 or 2010 (no need for double-hop migrations or migrating data in batches);
  • migrations from Office 365 (Microsoft 365) organizations to on-premises environments;
  • radically simplified migrations to new domains or forests;
  • easy public folder migrations;
  • different data filtering options (migrate only what you need);
  • more control over IMAP migrations;
  • intuitive user interface (no PowerShell skills required);
  • competitive price.

See a full comparison of CodeTwo Exchange Migration vs Exchange native migration tools.

Can I test CodeTwo Exchange Migration before buying it?

Yes, you can.

Unless activated with a paid license key, CodeTwo Exchange Migration is functional for 30 days, with the only limitation being that you can migrate a maximum of 10 items per folder. This means that if you’re using the program to migrate e.g. a user’s mailbox, only 10 emails from each mail folder, 10 calendar items from each calendar, 10 contacts from every contacts folder, etc., will be migrated.

Once you purchase the license and activate your copy of CodeTwo Exchange Migration, you can resume the migration and move all remaining items.

You can download the CodeTwo Exchange Migration installer here.

How does CodeTwo Exchange Migration work?

The program performs Exchange-to-Exchange migrations by accessing your source server mailboxes via Exchange Web Services (EWS) or MAPI (used primarily for legacy versions of Exchange Server) in order to read their contents. Then, the selected data is copied to the target server mailboxes (this time only via EWS).

To connect to an on-premises Exchange server, the user operating the program needs to have certain management roles assigned. If any required role is missing, the program will help you assign them. To establish a connection with source Office 365 (Microsoft 365) tenant, CodeTwo Exchange Migration is registered in that tenant’s Azure Active Directory. The registration can be performed automatically by the program (which is perfectly safe, as the program authenticates with your Office 365 tenant using OAuth 2.0 tokens), or you can decide to register the program by yourself (learn more).

During IMAP migrations, CodeTwo Exchange Migration reads data from email folders in source email accounts using the IMAP protocol, and then copies these folders and their contents to mailboxes on the target Exchange server.

It is necessary to have mailboxes prepared in the target environment prior to migration. If they are missing, you can automatically create them directly in the program. CodeTwo Exchange Migration can also automatically match source mailboxes with their target counterparts.

For more details on how the program works, see this article.

Can I migrate from Office 365/Microsoft 365?

Yes, you can. CodeTwo Exchange Migration lets you migrate mailboxes and public folders from Office 365 (Microsoft 365) to Exchange 2019, 2016, 2013 or 2010.

Learn more about migrating from Office 365 in the user’s manual.

Are migrations from Google Workspace, Zimbra and other non-Exchange platforms supported?

Yes, CodeTwo Exchange Migration supports migrations of emails from those and other servers, e.g. HCL Notes (formerly IBM Notes and Lotus Notes), Google Workspace (formerly G Suite), Zarafa or Kerio Connect via the IMAP protocol. Compared to IMAP migration tools provided by Microsoft, CodeTwo Exchange Migration gives you control over many more aspects of the process. For further details, see this page.

When migrating from IMAP servers, there are two limitations that you should be aware of:

  • you can only migrate email folders (due to the IMAP protocol limitations),
  • you have to provide credentials for all user accounts that you want to migrate.

Are migrations from hosted Exchange environments supported?

Yes, they are. 

To migrate from hosted (e.g. Rackspace) or other limited-access Exchange Server, the program uses the IMAP protocol to connect to the source server. Before the migration, make sure that IMAP4 is enabled on the source server, so that CodeTwo Exchange Migration can access source email folders and then replicate their contents in target mailboxes.

For further details see this page.

Will the program migrate encrypted emails?

The program will migrate encrypted emails as regular emails, which will be then normally accessible on the target server. The email encryption configuration will not be migrated and it needs to be reconfigured after migration. All emails from the source server are copied “as such” to the destination server and look exactly as the original.

Can the program migrate items between servers with different language versions?

Yes. CodeTwo Exchange Migration supports all languages, regardless of the language on the source and the target server. The software moves all special language characters so that all items can be migrated with no issues. Learn more in the user’s manual.

Do I have to pay to get support?

No, technical support for this product is included in the license price. Our team can be reached via phone or email. When necessary, online sessions are performed to help resolve issues. You can find out more about our technical support program on this page.

Additionally, we have made technical documentation for CodeTwo Exchange Migration available online for all users:

How is CodeTwo Exchange Migration licensed?

The application is licensed based on the number of source mailboxes you want to migrate. Each mailbox consumes 1 license once you start a migration job. To migrate public folders, you need to use up 25 licenses (this number is fixed; it does not matter how much data is contained in these folders).

For example, you purchased a 50-mailbox license and used our product to completely migrate 25 mailboxes and started migrating 10 more mailboxes. In this situation, you would have 15 seats left and could use them to migrate another 15 mailboxes from the source server.

Our licensing model also lets you use the remaining seats for a different migration project, e.g. migrate another source server.

For more on licensing, consult this article.

Can I purchase additional licenses after my initial purchase?

Yes. You can do this by selecting the Additional licenses option in the first step of the online order form.

If you need to purchase additional licenses for your current 2.x or 1.x version of the program, we recommend purchasing a 3.x license key for as many additional mailboxes as you need. Upgrade your program to version 3.x (the upgrade is free of charge for version 2.x and version 1.x users) and migrate the remaining mailboxes.

Find out how to perform an upgrade

What type of data can be migrated using CodeTwo Exchange Migration?

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

Where do I install the program?

You can install CodeTwo Exchange Migration anywhere in your source server domain – even on a workstation. If you are migrating from Office 365 (Microsoft 365), install the program on your target Exchange server.

How long does the migration process take? Are there any size or speed limits?

An average migration speed is between 500 MB and 2 GB per hour. However, the duration of the entire migration process depends on various factors.

CodeTwo Exchange Migration does not impose any limits on the size of migrated mailboxes and mailbox items nor on the migration speed. However, it might be possible that your Exchange Server imposes its own limits, which our program will not be able to override.

You also need to consider other environment-specific factors that can limit or increase the migration speed, including the quality of your internet connection (in the case of a migration to a different network), your local router throttling, source and target server throttling, performance of the computers involved, etc. Learn more...

Refer to the articles linked below to find out how to check and modify the native Exchange Server migration size and speed limits:

How is a direct migration from Exchange 2010 to 2019 possible?

Exchange Server 2019 does not support coexistence with Exchange Server 2010 (as well as with 2007 and 2003). This is Microsoft’s limitation (see this article for more). Therefore, only cross-forest migrations from Exchange 2003 to Exchange 2019 are possible.

Using only the tools provided by Microsoft, to go from Exchange 2010 to Exchange 2019, you would have to perform a double hop migration (i.e. update Exchange to 2013 or 2016, and then migrate to Exchange 2019). With CodeTwo Exchange Migration, this is not necessary, as the program can move mailboxes directly between any two Exchange Server editions. See this page to find out more.

Learn more about migrating from Exchange 2010 to Exchange 2019

How do I prepare my environment for the migration?

The requirements vary depending on the server which will be acting as the source in your migration. In this user’s manual article you will find links to information about preparing for all available migration scenarios.

Does the program support multi-factor authentication when migrating from Office 365/Microsoft 365?

Yes, it does. You can use your MFA enabled admin account when setting up a connection to the source Office 365 (Microsoft 365) server.

Can CodeTwo Exchange Migration auto-match source and target mailboxes?

Yes. CodeTwo Exchange Migration can match source and target mailboxes based on various predefined and custom attribute patterns. The default pattern will connect mailboxes based on users' names and display names. The program also allows you to match mailboxes manually. Learn more...

How does the program create mailboxes on the target server?

If during the auto-matching process the program detects that any of the source mailboxes do not have their counterparts on the target server, it will propose creating these mailboxes based on a set of source mailbox data. You can modify this set using a range of mailbox properties. Learn more...

Does CodeTwo Exchange Migration migrate public folders? How does this work?

Yes, CodeTwo Exchange Migration does migrate Exchange public folders. You just have to enable public folders on the target server (in the case of Exchange Server 2013/2016/2019, create a mailbox for them) and configure the program to include public folders in the migration. Our software will recreate the source server public folders tree on your target server and copy all items. In addition, the admin account used in the program to connect to the target Exchange server needs to be granted the Owner rights to all folders to which the data will be migrated (including the root public folder).

Additionally, bear in mind that migrating public folders reduces your CodeTwo Exchange Migration license by 25 users.

Can I migrate public folders in the same Active Directory forest?

No, you cannot. Exchange Server does not let you create the second public folder infrastructure in the same AD forest. Because of that, CodeTwo Exchange Migration lets you migrate public folders in a cross-forest migration scenario only.

It is also not possible to migrate public folders in a hybrid environment because you cannot have public folders in both on-premises Exchange and Office 365 (Microsoft 365) at the same time.

Does the program migrate free/busy statuses?

Free/busy statuses are generated ad hoc by the Exchange Server Availability Service, based on the content of users' calendars.

CodeTwo Exchange Migration migrates users' mailboxes, including their calendars. This means that, provided you have created users' accounts in AD and did not limit free/busy permissions in any way, the Availability Service will automatically update the free/busy statuses.

Does the program delete anything from the source server?

No, it doesn't. CodeTwo Exchange Migration accesses the source server data passively, which means that no data is deleted or modified on your source server.

Can source mailboxes still be used after they have been migrated?

Yes, they can. The data on the source server is not modified in any way, so you can keep using the source mailboxes without any limitations. If you do so, and later on want to migrate the new items that have been created in the process, simply click the Rescan button and the program will update the mailboxes on the target server by copying these items.

Help! Target server mailboxes addresses are not resolving and are not listed!

In some migration scenarios, such as a cross-domain migration, the target server email addresses may not resolve or be listed. In these cases, target mailboxes have to be selected manually by providing their addresses.

Is it possible to migrate mailboxes within the same domain using your program?

Yes, provided that the User Principal Names (UPN) of the source and target mailboxes are not the same. 

For example, it is not possible to migrate from server A to server B within the same domain, e.g., if both the source and target mailboxes are named In order to successfully carry out such a migration, you have to create a different mailbox for this user in the target location and name it differently, e.g.

Please note that other limitations still apply. Coexistence of Exchange 2003 and 2013/2016/2019, 2007 and 2016/2019 or 2010 and 2019 is not possible. Therefore, in this case a direct migration is only possible in a cross-forest scenario, which is fully supported by CodeTwo Exchange Migration. 

I am getting an error...

If you have encountered any problems with the application, follow the steps from Knowledge Base article about troubleshooting CodeTwo Exchange Migration.

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

We have also made all technical documentation for CodeTwo Exchange Migration available online for users. Use the below links to get to:

How to upgrade to version 3.0?

In order to upgrade CodeTwo Exchange Migration to version 3.0, you need to follow the steps from this article.