We have already talked a lot about Windows 10 losing support on October 14, 2025, with Microsoft encouraging customers to migrate to Windows 11 as soon as possible. The company is also offering a year of extended updates through both free and paid means for those who stubbornly want to remain on Windows 10. That said, it is important to note that this is not the only operating system reaching the end of life in three months.
Over on its Windows Health Release dashboard, Microsoft has posted an advisory reminding customers that, apart from Windows 10 version 22H2 in the General Availability Channel, Windows 10 2015 LTSB is losing support on October 14, 2025, too. For those unaware, LTSB is an abbreviation for Long-Term Servicing Branch, but it is now more commonly referred to as Long-Term Servicing Channel (LTSC).
The LTSB/LTSC branch is intended for enterprise customers who prefer a stable version of their operating system with minimal to no changes over time. While it does get security patches, new features are not rolled out. It is primarily meant for mission-critical industries like healthcare and manufacturing.
LTSC versions of Windows typically receive 10 years of support. The variant losing support in October 2025 is Windows 10 2015 LTSB. This is the launch version of Windows 10 and uses version 1507 as the baseline, for those who remember the history of the OS. After a launch in 2015, Microsoft ended mainstream support for version 1507 in 2017, but LTSB customers received an extra eight years of support, which are ending in about three months.
Following October 14, 2025, only the following LTSB/LTSC versions of Windows 10 will be supported:
- Windows 10 LTSB 2016 (version 1607)
- Windows 10 LTSC 2019 (version 1809)
- Windows 10 LTSC 2021 (version 21H2)
At this point, perhaps organizations using an LTSC version of Windows 10 should consider Windows 11 LTSC. Currently, Windows 11 only has one LTSC release, namely 2024 (version 24H2), which will enjoy mainstream support until October 2029.