Microsoft will retire its Microsoft 365 companion apps for Windows 11, including the Calendar, People, and Files companion apps, by December 16, 2026. These apps were introduced at no additional cost to users with eligible Microsoft 365 or Office 365 licenses, with the Files and People apps debuting in March 2025 and the Calendar app in May 2025. Microsoft integrated its Copilot feature into these applications last October. Users are advised not to wait until the retirement date, as the apps will become non-functional prior to December 16. Administrators can remove these apps as needed, and Microsoft has provided a template for notifying users. Alternatives for functionality include Outlook, Teams, Windows Search Box, File Explorer, SharePoint, OneDrive, and Office applications.