Title: Update Rollup 3 for Windows Small Business Server 2011
Replaces: SBS 2011 UR1 (KB2555251) and SBS 2011 UR2 (KB2668019).
Last Modified: 9/25/2012
Size: 1.2 MB
Restart behavior: Can request restart
May request user input: No
Must be installed exclusively: No
Requires network connectivity: No
Uninstall Notes: This software update can be removed via Programs and Features in Control Panel. Additional steps are required for a complete removal, please refer to KB2729100 for more details.
Uninstall Steps: n/a
In a nutshell, it’s mostly Windows 8 client support and .NET issues. It makes some changes to the BPA and WSUS too.
In addition to WU / MU downloads, you can get Update Rollup 3 for SBS from the Microsoft Update Catalog website link here.