April 13, 2021—KB5001393 (Security-only update)

April 13, 2021—KB5001393 Security-only update Important: Windows 8.1 and Windows Server 2012 R2 have reached the end of mainstream support and are now in extended support. Starting in July 2020, there will no longer be optional, non-security releases known as "C" releases for this operating syste...