Official documentation

Windows 10 support has ended on October 14, 2025

Microsoft, Microsoft Support, 2025

Read on October 16, 2026

What it is: Microsoft's notice that Windows 10 reached the end of support on October 14, 2025, after which it no longer provides technical assistance, feature updates or security updates, with advice to move to Windows 11.
How much weight it carries: Official Microsoft lifecycle notice; the primary source for the date.

Facts taken from this source

Windows 10 reached the end of support on October 14, 2025, after which Microsoft no longer provides technical assistance, feature updates or security updates.
“Windows 10 has reached the end of support on October 14, 2025. At this point technical assistance, feature updates and security updates is no longer provided.” (Introduction)
Microsoft says Windows 10 reached the end of support on October 14, 2025.
“Windows 10 has reached the end of support on October 14, 2025.” (First paragraph)
Microsoft says that after the end of support for Windows 10, technical assistance, feature updates and security updates are no longer provided.
“At this point technical assistance, feature updates and security updates is no longer provided.” (First paragraph)