Seems that after applying some of the listed gpo optimizations on my 2004 VDI machines wont work the following fuctionality:
Domain Join using GUI (Control Panel > System > etc)
Outlook autodiscover using GUI, for example, first time connecting to exchange, and further on. (Though autodiscover test works fine, all green).
Problems were gone after i deleted registry.pol in system32\GroupPolicy\Machine
I have exported it using lgpo before deleting, maybe someone more experienced can point me out to exact values that can cause this.
Lgpo export https://pastebin.com/zXa19Puc
Seems that after applying some of the listed gpo optimizations on my 2004 VDI machines wont work the following fuctionality: