I voted no, because really, how many Windows Server questions do we actually get? Very very few.
Windows OS forum does get a ton of traffic, it is often that I check in there and there are 15-20 threads with new posts since my last visit, and I'm usually on TS at least twice a day. I would guess about 70% are XP related and 30% Vista. So even at 30% of the total Windows OS posts a specific Vista forum would still get more activity than even Misc Software & Utilities.