Microsoft has announced that it will retire the Calendar, People, and Files companion apps for Microsoft 365 on December 16. The company has asked administrators to remove these apps from managed devices ahead of that date. The retirement applies specifically to the standalone companion apps, not to the core Microsoft 365 services they connect to.
Admins should plan to uninstall the apps from user devices before the cutoff to avoid disruption. Microsoft's guidance focuses on managed devices, suggesting that personal devices may also lose access but are not centrally controlled. The move simplifies the app ecosystem, though it may require users to rely on web or full desktop versions of these tools.
For security and privacy teams, this retirement is a reminder to audit installed software and ensure that deprecated apps are removed promptly. Keeping unsupported apps can introduce compatibility issues or security gaps, so acting before December 16 is recommended.