// deadlines · .NET

.NET Framework 3.5 SP1 reaches end of support.NET · 9 Jan 2029

.NET Framework 3.5 SP1 stops receiving security updates. Move legacy applications that still need it to .NET Framework 4.8.x or modern .NET.

In short: this takes effect on 9 Jan 2029. That's 796 days from when this page was built.

Time left

Countdown to 9 Jan 2029 (UTC).

What to do

Read the official notice: Microsoft source ↗.
Add every Microsoft deadline to your calendar: subscribe to the deadlines calendar.

Sources