Office 2021 has four months left to live, and Microsoft isn't budging. The company updated its support documentation this week confirming October 13, 2026 as the hard end-of-support date for the perpetual license suite. After that, no security patches, no bug fixes, no phone or chat support, and most online help content gets retired.
Microsoft has shown no interest in last-minute reprieves. It wants users on Microsoft 365 subscriptions, and it's making the alternative increasingly uncomfortable.
Still running Office 2021 past October means operating without any official security coverage. Vulnerabilities discovered after the cutoff will go unpatched. The software will still launch and function, but Microsoft's warning is blunt: "Microsoft will no longer provide technical support, bug fixes, or security fixes for Office 2021 vulnerabilities which may be subsequently reported or discovered."
This includes the security updates that protect PCs from viruses, spyware, and malware. The "pay once, own forever" argument for perpetual licenses was always conditional on Microsoft's willingness to support them.
Office 2021 was the last version many users considered stable and predictable, free from the beta AI tools Microsoft has been layering into 365. That era ends in October.
Users have two official paths forward: subscribe to Microsoft 365 or buy Office 2024. Both eliminate the security risk of running unsupported software.
For those determined to stay on Office 2021 past the deadline, the advice is grim. Keep the device offline entirely.
Download documents to the desktop first and scan them manually before opening. Keep Windows and its antivirus up to date.
Refuse new add-ins and automation scripts. Some users may fall back to LibreOffice for emergency file access and Office Online for compatibility checks.
None of this is a real security strategy. It's a mitigation at best.
The October 13 deadline gives Office 2021 holdouts roughly four months to pick a replacement. Microsoft has made clear there's no third option.
