WSUS - Windows Server Update Services
# displays the WSUS history
$Session = New-Object -ComObject "Microsoft.Update.Session"
$Searcher = $Session.CreateUpdateSearcher()
$historyCount = $Searcher.GetTotalHistoryCount()
$Searcher.QueryHistory(0, $historyCount) | Select-Object Title, Description, Date,
@{name="Operation"; expression={switch($_.operation){
1 {"Installation"}; 2 {"Uninstallation"}; 3 {"Other"}
}}}