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Powershell: List Updates that are not Installed

Using the Microsoft Update Session ComObject, it is easy to determine the updates that are not installed on a computer at a moment.

# initialize the com object
$wsus = New-Object -ComObject "Microsoft.update.Session"

# build an update searcher
$wsussearch = $wsus.createupdatesearcher()

# build a filter and get the result
$res = $"IsInstalled=0")

# list title and severity of updates that are not yet installed
$res.updates | Select-Object title, msrcseverity