Known Issue
| Date Logged | November 26th, 2024 |
| Product(s) | Mimecast for Outlook |
| Status | Not Fixing |
Issue
We are aware of the recent launch of Microsoft's new Outlook on Windows client, allowing users to opt-in to a new version of Outlook, and its lack of compatibility with Mimecast for Outlook.
The new Outlook client does not support COM Add-Ins, including Mimecast for Outlook. Currently, there is no straightforward migration path to the Office Add-In framework supported by the new Outlook client. Limited programmatic functionality in the new Microsoft Outlook prevents us from delivering Mimecast for Outlook in its current form.
We are currently gathering requirements to develop an alternative solution, potentially replacing the existing platform-dependent applications. This new solution will offer a unified and modernized user experience, serving as an alternative to our End User Applications.
Workaround
If you are using the new Outlook preview, the following applies:
Mimecast Essentials for Outlook and the Mimecast Personal Portal remain accessible for Mimecast features.
Customers who wish to continue using Mimecast for Outlook must revert to the 'Classic' Outlook. We are actively assessing our End-User Application portfolio to best deliver Mimecast features.
Mimecast for Outlook (MfO) will not function with the new Outlook due to the lack of COM add-in support.
Mimecast Essentials for Outlook (MEO) will remain fully supported with the current feature set.
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Microsoft allows opt-in to the new Outlook with at least one year's notice before transitioning to an opt-out model, followed by another year's notice before making it the default experience.
You can manage user opt-in options as outlined in the Microsoft Admin Control Guide.
Please see the following, for more information:- Microsoft's article on switching to the new Outlook for Windows; business accounts will be switched over to new Outlook automatically, starting January 2025.
- Microsoft's article on managing access to the new Outlook client.
- Microsoft's article on their opt-in, opt-out development model of the new Outlook client. See "Stage 3: Cutover" section for end of support details for classic Outlook.
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