Office 2021 Loses All Security Updates on 13 October 2026 — UK Licence Retailer WinCDKey Publishes Buyer Guidance Ahead of the Deadline
With no extended support phase and no paid Extended Security Updates programme, an estimated fifty days remain before every edition of Office 2021 — including the Long-Term Servicing Channel release — stops receiving patches. WinCDKey has published support-lifecycle disclosures across its catalogue so buyers can see, before purchase, exactly how long each licence remains supported.
United Kingdom, 24th Aug 2026 — Microsoft Office 2021 reaches end of support on 13 October 2026. After that date, Microsoft will no longer issue security updates, bug fixes, or technical support for any Office 2021 edition on Windows or Mac. The applications will continue to open and run, but every vulnerability discovered from that point onward remains permanently unpatched.
What makes this deadline unusual is...
