Learn all about the security and non-security updates that are published for Windows 8.1 and Windows Server 2012 R2 through Windows Update. These updates address issues and improve the overall reliability of the operating system.
On the left side of this page, there is a reference to all of the updates that have been released for this version of Windows. We recommend installing all updates for Windows that are available for your device. Installing the most recent update means you get all of the previous updates, as well, including important security fixes.