I have to upgrade the operating system of my Windows server 2012 running WSUS (v6.2.9200.16384) to 2012 R2.
Do I really have to uninstall WSUS before performing an in-place upgrade? Or does this apply only to previous WSUS versions?
Found this:
http://technet.microsoft.com/en-US/library/77f5db8a-4b8f-4bd5-8493-387310adf46e#BKMK_OVER
Upgrade from any version of Windows Server that supports WSUS 3.2 to Windows Server® 2012 R2 requires that you first uninstall WSUS 3.2.In Windows Server 2012, upgrading from any version of Windows Server with WSUS 3.2 installed is blocked during the installation process if WSUS 3.2 is detected, and you are prompted to first uninstall Windows Server Update Services prior to upgrading Windows Server 2012.However, because of changes in Windows Server 2012 R2, when upgrading from any version of Windows Server and WSUS 3.2 to Windows Server 2012 R2, the installation is not blocked. Failure to uninstall WSUS 3.2 prior to performing a Windows Server 2012 R2 upgrade will cause the post installation tasks for WSUS in Windows Server 2012 R2 to fail. In this case, the only known corrective measure is to format the hard drive and reinstall Windows Server 2012 R2.