Microsoft to retire Microsoft 365 Companion apps (Calendar, People, Files) on Dec 16 2026
What Happened – Microsoft announced that the Calendar, People, and Files companion apps, which embed Copilot‑enabled AI and have been auto‑installed on Windows 11 Enterprise devices, will reach end‑of‑life on 16 December 2026. After that date the apps will stop functioning and will no longer receive support. Administrators are instructed to uninstall the apps from all managed devices before the deadline; unmanaged devices must be cleaned up by end‑users.
Why It Matters for Trust & Control Assurance
- Continuous control‑assurance programs require a documented software‑lifecycle process; unsupported binaries represent a control gap that can be flagged in audits.
- Removing the apps and recording the decommission activity supplies defensible evidence for configuration‑management and change‑control objectives.
- The retirement aligns with the need to keep identity‑verification methods up‑to‑date (e.g., moving from SMS to passkey authentication), reinforcing a broader identity‑governance control set.
Who Is Affected – Enterprises that deploy Windows 11 with Microsoft 365, spanning most verticals (technology, finance, health, education, etc.), and the IT teams that manage those endpoints.
Recommended Actions
- Run an inventory scan to confirm which devices have the companion apps installed.
- Use the Apps Admin Center or endpoint‑management tools to push a bulk uninstall before 16 Dec 2026.
- Document the removal in your configuration‑management database (CMDB) and capture screenshots or logs as audit evidence.
- Review related startup‑auto‑launch settings to ensure no residual processes remain.
- Align the upcoming SMS‑sign‑in deprecation (Feb 2027) by completing the passkey or FIDO2 migration plan.
Technical Notes – The companion apps integrate Copilot for AI‑driven assistance, auto‑install via Microsoft 365 Apps updates, and auto‑launch at user log‑on. Admins can opt‑out of installation through Device Configuration settings in the Apps Admin Center; users can disable auto‑launch in each app’s Settings dialog.