There are now two Microsoft Outlook add-ins (COM and Web add-in). When should I use each one?

There are two add-ins for Microsoft Outlook that can be used independently or in conjunction to provide optimal user experience and security coverage. Both add-ins are centrally managed and can be deployed to use the same policy configuration.

To understand when to use each add-in, see the Outlook Add-Ins - COM vs Web Add-In article.

Which version of Microsoft Outlook should I use?

This answer is entirely up to your organization. We support all versions of Microsoft Outlook as we offer a Web and COM add-in.

How long will there be support for Classic Outlook and the COM add-in?

Microsoft has confirmed that Support for Classic Outlook and COM will continue until 2029. We will also continue to support this until then.

When I send emails, I find that some of my emails are stuck in my Drafts folder.

Unfortunately, this is a known issue when you click away too quickly while the email is being processed. We have raised this with Microsoft to fix it.

Do I need to switch to the New Outlook and the web add-in to use Microsoft Copilot?

Microsoft has announced support for Copilot in Classic Outlook in their recent roadmap updates, as shown in the Microsoft 365 Roadmap - See What's Coming | Microsoft 365 article. You can find further Microsoft 365 requirements in the Microsoft Copilot for Microsoft 365 requirements | Microsoft Learn article.

Are there any prerequisites for using the new Web add-in?

Customers wanting to use this must be native Microsoft 365 only, with no on-premise services.

The admin must have access to the following:

• Office JS Manifest
• Administrative rights to the Microsoft 365 admin portal
• Optional: Microsoft 365 or Azure AD group to assign Office JS to a user group
• Outlook JavaScript API requirement set 1.8 or later

Deployment is done via the Microsoft 365 admin portal as an integrated app. This deployment will need to be performed as a one-off task by a Microsoft 365 admin with one of the below roles:

• Global Administrator
• Exchange Administrator combined with one of either Cloud App Admin, App Admin, or Privileged Role Admin