WindowsUpdateClasses type  
Defines values for WindowsUpdateClasses. 
KnownWindowsUpdateClasses can be used interchangeably with WindowsUpdateClasses,
this enum contains the known values that the service supports.
Known values supported by the service
Unclassified 
Critical 
Security 
UpdateRollup 
FeaturePack 
ServicePack 
Definition 
Tools 
Updates
type WindowsUpdateClasses = string