[Exclude specific subnet from discovery]

Just a rapid answer: there's a way to exclude, you can use collections or OUs if i remember.. So VDIs are in a seperate OU ?

[Group Policy Preference Registry settings do not show in results...]

Strange...You can see applied GPPs using the Group Policy Results Wizard in GPMC. Can you retry after making "gpupdate /force" on the client ?? maybe a sycnhro issue ??

if you try " gpresult.exe /v >> verbose_out.txt" or "gpresult.exe /Z >> zuperverbose_out.txt" on client after "gpupdate /force" ??

[Office 2013 Package Keeps Returning 30059]

when using OCT did you specify licensing option ? MAK or KMS ...

[Citrix XenApps]

?? Sorry but these are not really apps... Can you explain a little bit more ??

Wanna just install them locally on a Windows server which has XenApp layer (VDA) ??

 

If so, yes, just make 4 packages in SCCM and then deploy on your XenApp or XenDesktop Server(s) ..

 

Can hehp if you need more info...