SCCM2012 Sp1 CU3

Add support for Windows 8.1 in SCCM 2012 SP1 – With CU3

• Software distribution
• Software update management
• Compliance Settings

Will also support Endpoint Protection on the following OS

• Windows 8.1 Pro
• Windows 8.1 Enterprise
• Windows Server 2012 R2 Standard
• Windows Server 2012 R2 Datacenter

http://blogs.technet.com/b/configmgrteam/archive/2013/09/16/support-questions-about-win-8.1-and-winsvr-2012-r2-for-configmgr-and-endpoint-protection.aspx