Preparing WSUS for Windows 8 or Windows 2012

In order to provide updates to Windows 8 or Windows Server 2012 from local WSUS, Microsoft has released an update KB2734608. This update is prepared for WSUS 3.0 SP2.
More info on how to install the update check http://support.microsoft.com/kb/2734608 .

Delete client from WSUS by accident

If you accidentally delete client from WSUS, you can bring it back by using wuauclt. From client computer you can force registration on WSUS using:

wuauclt /resetauthorization /detectnow

After running this command accidentally deleted client from WSUS, will register again on WSUS and can be located in unassigned computers.