Knowledge Base

Legacy CodeTwo Signatures Add-in for Outlook (COM Add-in)

This article is about the legacy COM Add-in that will soon be retired. We recommend switching to our new Web Add-in to enjoy all the features of the COM Add-in & much more. Learn more about the Web Add-in and see how to switch.

The legacy CodeTwo Signatures Add-in for Outlook (COM Add-in) lets end users insert CodeTwo signatures as they type an email in Outlook for Windows – either automatically (if a signature is set as default) or manually from the Outlook ribbon. With the add-in's pane, end users can also force-refresh updated signatures and preview other CodeTwo signatures made available to them by organization's administrator(s). Use the links to learn more.

For administrators:

For end users:

The modern Web Add-in vs. the legacy COM Add-in

While the COM Add-in still remains fully functional, we strongly recommend that you go with our modern Web Add-in to enjoy full support, greater functionality and security plus new features.

If you look for a handy comparison to help you decide which add-in to deploy, see the table below and learn about the advantages of each solution: 

 Modern Web Add-inLegacy COM Add-in
Supported platforms

Outlook for Windows
Outlook for Mac
Outlook on the web (OWA)
Outlook for iOS and Android (early access)

Learn more about supported Outlook versions

Outlook for Windows

Learn more about supported Outlook versions
Supported signature modeAllOutlook & combo only
DeploymentCentral via the Microsoft 365 admin center

Deployment instructions
Central via GPO or Intune, or individual by Outlook users

Deployment instructions
How are signatures inserted?Automatically (event-based) or manually (via the CodeTwo Signatures pane)Automatically or manually (via the Outlook's Signatures command) 
Who gets signatures?Users defined in Outlook (client-side) signature rulesUsers defined in Outlook (client-side) signature rules as well as other Outlook users1
Preview of cloud signaturesYes

Learn more
No
Disable users' default Outlook signaturesYes

Learn more
Yes (Outlook for Windows only)

Learn more
Switch between Outlook and cloud signaturesYes

Learn more
No
Support for CodeTwo One-click surveys YesNo
User sign-in requirementNoYes
How often the add-in syncs with CodeTwo services?Real-time synchronization2Every couple of minutes or manual

1 CodeTwo Outlook signatures added by the COM Add-in can be accessed by and used with other accounts configured in the same Outlook app where the add-in is installed.

Changes made in the signature management app are instantly applied to signatures in Outlook.

If you've decided to continue with the legacy COM Add-in, read on to get all the instructions and information.

System requirements

Legacy CodeTwo Signatures Add-in for Outlook / COM Add-in (Outlook for Windows only)
Required permissions:To install the legacy COM Add-in, no administrative credentials are required. However, if the required version of .NET Framework is missing, a user must have administrator privileges to install it.
Requirements:Outlook:
  • 32 or 64-bit versions of Outlook 2013 or later,
  • at least Windows 7 SP1 or Windows Server 2008 R2 SP1,
  • .NET Framework 4.7.1.

Deploying the legacy COM Add-in

Read this before the deployment

Before you start, make sure your tenant is registered to CodeTwo (see instructions), set up to work in Outlook or combo signature mode (learn more) and you have created signature rules for Outlook (learn more).

If you have already deployed CodeTwo Signatures Web Add-in for Outlook & OWA (the modern Web Add-in) to your users, you need to uninstall it first before deploying the legacy COM Add-in, as you can only use either of them. Otherwise, the add-ins can conflict with each other.

The add-in requires .Net Framework 4.7.2 installed on users' machines to work correctly.

To keep synchronizing signatures, the add-in automatically turns off the Roaming Signatures (cloud signatures) feature in Outlook. Learn more

There are three different methods of deploying the legacy CodeTwo Signatures Add-in for Outlook (COM Add-in). Choose the one that best fits your preferences and scenario:

Centralized deployment of the legacy COM Add-in

Follow the steps in this section to automatically install the legacy COM Add-in for users in your organization using GPO. You can deploy the add-in for all users, selected security groups, OUs, or Entra ID (Azure AD) groups. Use the links below for instructions:

Deploy COM Add-in to the whole organization

  1. Download the legacy CodeTwo Signatures Add-in for Outlook (COM Add-in) by clicking this link. Save the MSI installation file to a shared network location.
  1. On your Windows Server, press Win + R to launch the Run console, type gpmc.msc and click OK (Fig. 1.) to open the Group Policy Management Editor.

Using the Run console to launch the Group Policy Management Editor.
Fig. 1. Using the Run console to launch the Group Policy Management Editor.

  1. Go to Forest > Domains, right-click your domain and choose Create a GPO in this domain, and Link it here... (Fig. 2.).

Create a new GPO in your domain.
Fig. 2. Create a new GPO in your domain.

  1. Name your new GPO, set Source Starter GPO as none (Fig. 3.).

Name the new GPO.
Fig. 3. Name the new GPO.

  1. Right-click the newly created GPO and choose Edit... from the shortcut menu (Fig. 4.).

Edit the new GPO.
Fig. 4. Edit the new GPO.

  1. Go to User Configuration > Policies > Software Settings, right-click Software installation and choose New > Package from the shortcut menu (Fig. 5.).

Create a new software deployment package.
Fig. 5. Create a new software deployment package.

  1. Select the MSI file you saved in step 1 from the network share (Fig. 6.).

Select the CodeTwo Signatures Add-in for Outlook.
Fig. 6. Select the CodeTwo Signatures Add-in for Outlook.

  1. In the new window, select Assigned and click OK (Fig. 7.).

Choose the deployment method.
Fig. 7. Choose the deployment method.

  1. Double-click the newly created package (Fig. 8.).

Double-click the deployment package.
Fig. 8. Double-click the deployment package.

  1. On the Deployment tab, select Install this application at logon, then select Basic and click OK (Fig. 9.). You can close the Group Policy Management Editor afterwards.

Set up add-in deployment properties.
Fig. 9. Set up add-in deployment properties.

  1. The next time a user in your organization restarts their machine and signs in, CodeTwo Signatures Add-in for Outlook should be installed automatically at startup (Fig. 10.). The user doesn’t need to have local admin rights to install the software correctly.

CodeTwo Signatures Add-in for Outlook is being installed at system startup.
Fig. 10. CodeTwo Signatures Add-in for Outlook is being installed at system startup.

  1. (Optional) If the add-in is not installed, after the restart, it might be that the GPO settings have not propagated yet. You can use the gpupdate /force command in the Run (Windows +R) console on the client’s machine to force-apply the GPO settings. After the user signs out and signs in, the add-in should be installed immediately.
  2. After installation, the add-in is available in Outlook and opens in the right pane. (Fig. 11.). Users can change its width to resize it. Using a dedicated button on the ribbon hides/shows the add-in pane.

This is how CodeTwo signatures add-in appears in Outlook right after installation.
Fig. 11. This is how CodeTwo signatures add-in appears in Outlook right after installation.

  1. To have CodeTwo signatures automatically added to Outlook, each user needs to click Sign in in the add-in pane. When a Microsoft sign-in screen appears, a user needs to sign in using their Microsoft 365 work account credentials and accept the permissions to synchronize the add-in with Outlook and get signatures.
  2. When a user is signed in, the add-in pane shows signatures that are available for them. Depending on your organization's settings, these signatures can be added automatically (when users compose a new message or reply to/forward a message) or users can add them on their own in compose mode in Outlook, just as they would normally add Outlook signatures: they need to go to the Message tab, click Signature on the ribbon and choose any signature that is available. Learn how to use the add-in.

Deploy COM Add-in to a security group

  1. Follow steps 1-4 from section Deploy the add-in to the whole organization.
  2. Select the newly created GPO. In the Security Filtering section, click Add (Fig. 12.) and select the security group or (groups) to which you want to deploy the add-in.

Filtering GPO deployment for a security group.
Fig. 12. Filtering GPO deployment for a security group.

  1. On the Delegation tab, make sure the security group(s) you have chosen in the previous step and the Authenticated Users group are all listed (Fig. 13.). Use the Add button if any group is missing. Next, click Advanced to manage group permissions.

GPO delegation tab.
Fig. 13. GPO delegation tab.

  1. For the GPO to work correctly, you need to assign Read permissions to the Authenticated Users group (Fig. 14., left), and assign the Read and Apply group policy permissions (Fig. 14., right) to the security group(s) you selected for the add-in deployment.

Delegation rights for security groups.
Fig. 14. Delegation rights for security groups.

  1. Follow steps 5-15 from section Deploy the add-in to the whole organization, to deploy the add-in for the chosen security group(s).

Deploy COM Add-in to an Organizational Unit (OU)

It is also possible to deploy CodeTwo Signatures Add-in for Outlook to a chosen OU. To do that, follow all the steps from section Deploy the add-in to the whole organization but in step 3, instead of right-clicking your domain, right-click the OU for which you want to have the add-in installed (Fig. 15.).

Create a GPO for an Organizational Unit.
Fig. 15. Create a GPO for an Organizational Unit.

Individual deployment of the legacy COM Add-in

If you've already configured CodeTwo Email Signatures 365 to add email signatures in Outlook, you can ask your users to complete the last stage of the deployment by themselves – install CodeTwo Signatures Add-in for Outlook (legacy COM Add-in) by following the instructions below:

  1. Download CodeTwo Signatures Add-in for Outlook by using this link.
  2. Launch the downloaded setup file and click Install (Fig. 16.). The add-in is a ClickOnce application and doesn’t require local admin rights to be installed.

Installation of the Signatures Add-in for Outlook.
Fig. 16. Installation of the Signatures Add-in for Outlook.

  1. Click OK after the installation is finished.

    Info

    The add-in is installed for the current user profile only. If a machine is shared between users, each of them will need to install the add-in separately.

  1. Launch your Outlook to see the new add-in. If Outlook was already open during the installation, you need to restart it to apply the changes.
  2. The add-in is now available in your Outlook and opens in the right pane. (Fig. 17.). You can change its width to resize it. Use a dedicated button on the ribbon to hide/show the add-in pane.

This is how CodeTwo signatures add-in appears in Outlook right after installation.
Fig. 17. This is how CodeTwo signatures add-in appears in Outlook right after installation.

  1. In the add-in pane, click Sign in. A Microsoft sign-in screen appears. Sign in using your Microsoft 365 work account credentials and accept the permissions to synchronize the add-in with your Outlook and get automatic signatures.
  2. When you're signed in, the add-in pane shows signatures that are available for you. Depending on your organization's settings, these signatures can be added automatically (when you compose a new message or reply to/forward a message) or you can add them yourself in compose mode in Outlook, just as you normally add Outlook signatures: go to the Message tab, click Signature on the ribbon and choose any signature that is available to you. Learn more about the add-in

    Updating and uninstalling the add-in deployed individually (by an end user)

    When a new version becomes available, the add-in will always update automatically on Outlook start-up – just follow the simple on-screen instructions.

    To uninstall the add-in, complete the steps you can find here.

Updating the legacy COM Add-in

When the CodeTwo Signatures Add-in for Outlook is installed via GPO, the administrator can control when to update it for users in the organization.

Info

If the add-in has been installed manually by users, it will be updated to the newest version automatically.

To update the CodeTwo add-in distributed via GPO to the most recent version, follow the steps below:

  1. Download the most recent MSI installation file from here. Save it to a shared network location.
  2. On your Windows Server, open the Group Policy Management Editor, find the GPO you have used to deploy CodeTwo Signatures Add-in for Outlook, and follow steps 2 and 5 from Deploy the add-in to the whole organization to start editing it.
  3. Go to User Configuration > Policies > Software Settings and you should see the software package you previously deployed. Right-click below it and click New > Package (Fig. 18.).

Deploying a new software installation package.
Fig. 18. Deploying a new software installation package.

  1. Choose the .msi file you just downloaded (in step 1) and click Open (Fig. 19.).

Opening the add-in installation file.
Fig. 19. Opening the add-in installation file.

  1. In the new window, choose Advanced as the deployment method (Fig. 20.).

Choosing the Advanced deployment method.
Fig. 20. Choosing the Advanced deployment method.

  1. Deployment settings’ window opens automatically. On the Deployment tab (Fig. 21.) choose the Assigned deployment type, highlight the Install this application at logon checkbox and select Basic user interface options.

Setting the deployment options.
Fig. 21. Setting the deployment options.

  1. Go to the Upgrades tab (Fig. 22.), click Add and choose the software package you have deployed previously. The new package will upgrade the previously deployed add-in to the newest version. Click OK in both windows and close the Group Policy Management Editor.

Adding the Upgrade Package.
Fig. 22. Adding the Upgrade Package.

  1. The next time the users defined in your GPO’s scope log on to their machines, the add-in should be updated automatically. You can use the gpupdate /force command in the Run (Windows +R) console on each user’s machine to force the GPO settings to apply immediately. After the user logs off their Windows account and logs on again, the add-in will be updated automatically to the new version.

Uninstalling the legacy COM Add-in

First, sign in to app.codetwo.com, unpublish all your Outlook (client-side) signature rules and save the changes. This will clear all CodeTwo signatures on the computers of users who have been using the legacy CodeTwo Signatures Add-in for Outlook (COM Add-in).

Then, you need to uninstall the add-in. If the add-in was installed manually, you need to instruct your users to uninstall it from their computers the same way as you uninstall other CodeTwo desktop components.

If you deployed the add-in with Microsoft Intune, go to this article to learn how to uninstall it for all users or group(s) of users in your organization.

If you installed the CodeTwo Signatures Add-in for Outlook for multiple users with GPO, you can uninstall it from all machines at once by following these steps:

  1. Press Win + R to launch the Run console, type gpmc.msc and click OK (Fig. 23.) to open the Group Policy Management Editor.

Accessing the Group Policy Management Editor.
Fig. 23. Accessing the Group Policy Management Editor.

  1. Find the GPO you used to deploy the CodeTwo Signatures Add-in for Outlook and edit it (Fig. 24.).

Editing the GPO used to install the add-in.
Fig. 24. Editing the GPO used to install the add-in.

  1. In the GPO settings, go to User Configuration > Policies > Software Settings > Software installation, right-click the software package you used to deploy the add-in and click All Tasks > Remove (Fig. 25.).

Removing the add-in’s software package.
Fig. 25. Removing the add-in’s software package.

  1. Choose the option to Immediately uninstall the software from users and computers (Fig. 26.) and click OK to confirm.

Choosing the option to uninstall software package immediately.
Fig. 26. Choosing the option to uninstall software package immediately.

  1. The add-in should be uninstalled from users’ profiles on the next logon. To speed it up, users can use Command Prompt or PowerShell to force the Group Policy update with the gpupdate /force command (Fig. 27.) The console can log off the user automatically, so that the logon script can uninstall the add-in right away.

Forcing a Group Policy update.
Fig. 27. Forcing a Group Policy update.

Guidelines for new users

This section is for you if your organization's IT administrator has installed the legacy CodeTwo Signatures Add-in for Outlook (COM Add-in) in your Outlook for Windows. Its purpose is to explain what CodeTwo Email Signatures 365 and the COM Add-in are and what they do.

If you are an administrator, go to this section

CodeTwo Email Signatures 365 is a software solution that allows for central management of email signatures, disclaimers, branding and automatic replies in Microsoft 365 (Office 365) organizations. Signatures are added automatically (on Microsoft Azure servers) once a message is sent or directly in Outlook as you type an email (the way signatures are added in your organization depends on which signature mode has been set by your administrator). All email clients and devices are supported.

The legacy CodeTwo Signatures Add-in for Outlook (COM Add-in) is one of the components of CodeTwo Email Signatures 365. It's an add-in for Outlook for Windows (Fig. 28.) that lets you sync CodeTwo signatures (prepared for you by organization administrator(s)) to add them while composing an email. For more details on using the add-in, go to the next section.

The legacy COM Add-in's icon and pane in Outlook for Windows.
Fig. 28. The legacy COM Add-in's icon and pane in Outlook for Windows.

Using the legacy COM Add-in

To have access to Outlook (client-side) signatures, you need to sign in to the legacy COM Add-in with your Microsoft 365 account credentials. CodeTwo signatures added by the add-in are available just like any other Outlook signatures. If they are set as default by your organization's admin, they are added automatically when you compose a new message or when you forward/reply to an email (Fig. 29.). 

CodeTwo Signatures Add-in for Outlook automatically adds your default signature as you type. You can also preview the other available signatures via the add-in pane.
Fig. 29. CodeTwo Signatures Add-in for Outlook automatically adds your default signature as you type. You can also preview the other available signatures via the add-in pane.

You can also add the signatures from your Outlook ribbon – in compose mode, go to the Message tab, click Signature on the ribbon (Fig. 30.) and choose any signature that is available to you (if a signature is already added to your message, it will be replaced with the one you selected).

You can use Outlook's ribbon to add/change a signature.
Fig. 30. You can use Outlook's ribbon to add/change a signature.

Click the add-in button on the Outlook ribbon to show/hide the add-in pane. Note that the button might not be visible if you open a message in a new window. You can use the add-in pane to:

  • quickly preview the signatures that are available to you,
  • force signature refresh (Fig. 31.) if you do not want to wait for automatic signature synchronization that occurs every couple of minutes,
  • sign in or sign out of your user account.

You can access the Force signature refresh functionality by opening the add-in pane.
Fig. 31. You can access the Force signature refresh functionality by opening the add-in pane.

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