Fallback software update point - social. technet. microsoft. com If you completely remove the existing one and add a new one, yes, the clients will switch over to it They (the clients) will all completely redownload the entire catalog though so be aware of this and its impact on the network and the WSUS instance itself -- you *may* be able to mitigate this by using the existing WSUS DB though (backup on existing and restore on new)