you maybe able to combine the get-hotfix answer above and https://blogs.technet.microsoft.com/heyscriptingguy/2009/03/09/hey-scripting-guy-how-can-i-list-all-updates-that-have-been-added-to-a-computer/
to get your total number
Edited bysimbrook2Wednesday, August 30, 2017 1:07 PM