Microsoft Announces End of Support for 365 Companion Apps on Dec. 16

Microsoft has confirmed that its stand‑alone Calendar, People, and Files companion applications for Microsoft 365 will be discontinued on December 16. The company is urging administrators to uninstall the apps from any managed devices before that date to avoid disruption.

The three companion apps, originally launched to give users quick access to core productivity data on mobile and desktop platforms, have increasingly overlapped with functionality built into the main Microsoft 365 suite, such as Outlook, Teams, and OneDrive. In recent years, Microsoft has been consolidating features into fewer, more integrated experiences, and the retirement reflects that strategic direction.

Administrators are advised to use Microsoft Endpoint Manager or other device‑management tools to remove the apps from corporate‑owned hardware. The company’s guidance notes that the removal process should be completed well before the December deadline to ensure that users do not encounter missing icons or broken shortcuts after the shutdown.

Users who continue to rely on the companion apps for quick access to calendars, contacts, or file listings will need to transition to the native Microsoft 365 interfaces. Outlook’s calendar view, the People tab in Teams, and the Files section in OneDrive all provide comparable, and in many cases richer, capabilities that sync across devices.

The move follows previous retirements of legacy Microsoft tools, such as the discontinuation of the Office mobile apps for older operating systems. By streamlining its app portfolio, Microsoft aims to reduce maintenance overhead, improve security posture, and focus development resources on the core suite that serves the majority of its enterprise customers.

While the retirement does not affect the broader Microsoft 365 service, organizations should communicate the change to end users and offer guidance on navigating the integrated apps. Microsoft has not announced any replacement for the companion apps, indicating that the existing suite will continue to meet the needs of most users moving forward.