Office LTSC 2021 end of support
⚠️ Office LTSC 2021, Project LTSC 2021 and Visio LTSC 2021 reached end of support on October 13, 2026: Microsoft no longer provides updates, security fixes or technical support.
🛡️ Customers can keep running the software, but unsupported deployments carry security and reliability risks.
👉 CSPs and advisors should identify affected customers and assess supported alternatives, including Microsoft 365 suites, Project Plan 3 and Visio Plan 2.
📅 Where regulatory, connectivity or technical constraints prevent a cloud move, Microsoft also points to the 2024 LTSC versions.
🤖 Copilot requires supported cloud-backed Microsoft 365 apps rather than perpetual on-premises Office.
Partner briefing
- What it is
End of support for Office, Project and Visio LTSC 2021.
- What’s changing
Updates, security fixes and technical support ended October 13, 2026. Software may still run, but supported alternatives should be assessed.
- Why it matters
Unsupported deployments create security and reliability risks. Microsoft points to cloud options and, where appropriate, 2024 LTSC alternatives.
- Who it affects
CSPs and advisors serving customers using LTSC 2021.