Microsoft to retire Microsoft 365 Companion apps in December

September 21, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft will retire the Calendar, People, and Files Microsoft 365 companion apps on December 16 and has asked admins to remove them from managed devices.

Key Takeaways

Microsoft has announced the retirement of Microsoft 365 Companion apps in December, marking the end of companion applications that extended Office functionality across devices.
Users relying on Microsoft 365 Companion apps should plan migration to alternative solutions or first-party Microsoft applications before the December retirement deadline.
IT administrators should identify users of the affected Companion apps and communicate migration paths to ensure continued productivity after the December deprecation date.