As you know, Microsoft has been working on developing a new modern Outlook client matching the UI from Outlook Web Access and aimed to provide the same features and functionalities.
While this new Outlook client has been generally available for some time with option for customers to control whether to use the classic or the new client on Windows devices, now it time for Microsoft to switch to the new Outlook client.
Well, not now for say but starting April 2026, Office 365/Microsoft 365 customers will get an automatic switch to use new Outlook client.
By providing early notification, it allows you to gradually manage the deployment and use of new Outlook client.
At this stage, if any of the below context is true end-users will not be switched to use the new Outlook client:
- Office perpetual licences (aka MSI install)
- Exchange on-premises account
- New Outlook toggle is hidden by policy (either from the M365 App administration or group policy) (more details available here Control installation and use of new Outlook – Microsoft 365 Apps | Microsoft Learn)
