Microsoft will retire the Calendar, People and Files Microsoft 365 companion apps on December 16, ending support for the three taskbar tools it began pushing onto Windows 11 machines less than a year ago. The company urged information-technology administrators to strip the apps from every managed device in their organizations before that date. Unmanaged-device users have been told to uninstall the apps themselves.
The companion apps integrate Copilot for contextual AI assistance and were built to help people locate colleagues, reach Microsoft 365 and locally stored files, and manage a calendar directly from the Windows 11 taskbar. Each one was meant to sit one click away rather than requiring a full Outlook or Teams window, cutting down on the context-switching Microsoft’s own materials blamed for lost productivity across a workday.
Calendar, People and Files shut down December 16
Microsoft announced the December 16 retirement date and said in a Microsoft 365 message center update that the companion apps will no longer function or be supported after that date, urging admins to remove them from devices in their tenants beforehand. The update went out on a Friday and doubled as notice that new installations through Microsoft 365 Apps updates had already stopped that same day.
Once installed, the apps also launch automatically at startup by default, designed to “show relevant results as soon as users open the app,” according to Microsoft’s support documentation. Microsoft’s announcement gave no explanation for retiring tools it had been actively pushing onto enterprise machines for less than a year; the message center update focused entirely on the mechanics of the shutdown, leaving the reasoning behind reversing course unstated.
The retirement reverses last October’s force-install rollout
The retirement marks a reversal from just eleven months earlier. Microsoft announced in October 2025 that it would begin automatically installing the three companion apps on every Windows 11 enterprise device running the Microsoft 365 desktop client apps, with that automatic rollout completing by the end of December 2025. The rollout applied specifically to machines already running the full Microsoft 365 desktop suite, meaning organizations still on Windows 10 or without those desktop apps were never enrolled in the first place.
Admins could opt out of the automatic installation through Device Configuration settings in the Apps Admin Center, and individual users could stop the apps from launching automatically by disabling the auto-launch-at-login option in each app’s own settings dialog. Few organizations appear to have exercised either option before the December 2025 deadline arrived, since the companion apps still had to be actively removed rather than simply left dormant.
Uninstalling now falls on admins and users of unmanaged devices
Starting the same Friday, Microsoft stopped installing the companion apps through Microsoft 365 Apps updates altogether. Because the apps had already reached compatible systems automatically for months, the burden of removing them now sits with the people who received them: administrators managing enterprise fleets, and individual users on devices no admin controls.
Neither audience gets an automated removal path. Microsoft’s guidance asks administrators to delete the apps from the devices in their tenants, and tells everyone else to uninstall the three programs the way any other Windows 11 app is removed. The apps stop working on December 16 whether or not anybody acts, so the cleanup amounts to clearing dead icons off a taskbar rather than repairing anything that breaks.
Independent trackers of Microsoft’s admin communications, including the Microsoft 365 Message Center Archive, logged the retirement notice under the same MC1474111 reference number Microsoft used internally, giving administrators without direct tenant access a way to confirm the deadline. The distinction between the two audiences matters: cleanup duties from an installation nobody had to request, followed nine months later by a retirement nobody has to explain to end users, because the underlying Outlook, Teams and File Explorer functionality never moved.
Passkey migration for Entra ID follows the same Friday update
The same day, Microsoft reminded administrators to migrate Entra ID users to phishing-resistant sign-in methods such as passkeys, QR code authentication or FIDO2 security keys, warning that SMS-based first-factor sign-in will itself be retired starting in February 2027. Bundling the two notices suggests Microsoft is working through a broader backlog of legacy features ahead of the calendar turning toward 2027.
For administrators, the compressed timeline mirrors a broader pattern this year: Microsoft has bundled several Microsoft 365 and Windows 11 lifecycle changes into single message center updates, requiring IT teams to track multiple retirement and migration deadlines simultaneously rather than one change at a time.
Companion-app data will not be affected by the shutdown, since the apps are additional interfaces onto information that already lives in Outlook, Teams, the Windows Search box, File Explorer, SharePoint and OneDrive. What is not yet public is how many organizations actually adopted the companion apps during their year on the taskbar, a number Microsoft has not disclosed.
More from Morning Overview
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
