Several major software ecosystems have issued firm End‑of‑Life (EOL) notices for 2026. These deadlines mean the affected products will lose all security support, leaving systems vulnerable unless upgraded.
| Product | EOL Date | Key Impact |
|---|---|---|
| Windows 11 (Version 24H2 – Home & Pro) | October 13, 2026 | End of servicing; no more security or feature updates. Upgrade to newer builds or Windows 12. |
| Microsoft Office 2021 / Office LTSC 2021 | October 13, 2026 | Support closure; migrate to Microsoft 365 or next LTSC release. |
| .NET 8 & . NET 9 | November 10, 2026 | Both standard and LTS versions reach final EOL. Developers must plan migration to .NET 10. |
| SQL Server 2016 | July 14, 2026 | Already in absolute EOL phase; upgrade to SQL Server 2022 or Azure SQL. |