Office 2021 End of Support: What Ended on October 13, 2026 and What Your Nonprofit Should Do
October 16, 2026
The Office 2021 end of support came on October 13, 2026, with no extension and no extended security updates, according to Microsoft’s end of support notice. Microsoft says the apps may continue to function but warns of “serious and potentially harmful security risks”. Windows 10 support ended October 14, 2025,