Microsoft preps for a year of enterprise-impacting M365 retirements
Administrators at Microsoft shops are in for a wild 2025 as Redmond prepares to deprecate and retire more than just support for Windows 10.
The timeline of doom for Microsoft 365 admins was summarized in an AdminDroid blog post that detailed what was destined for the Redmond graveyard.
February looks like being a challenge. Exchange Online Legacy Tokens are set to be turned off, although administrators can buy a few more months via PowerShell. However, the option to re-enable Legacy Tokens will go away in June, and the whole system will be turned off for all tenants in October.
The most significant impact of the deprecation of Legacy Exchange Online Tokens will be around old Outlook add-ins, which are often used to glue enterprise processes together. COM add-ins are unlikely to be affected, but Outlook web add-ins probably will be since they can use Office.js APIs that rely on the tokens.
The Role-Based Access Control (RBAC) Application Impersonation role is also on its way out in February. The role was a handy way of granting access to multiple mailboxes, but these days Microsoft would much rather have apps registered with Entra.
