Have you ever had Active Directory go sideways? I mean, really badly? In a large (100+ employee) setting? If not, please don't say "it just works", especially when you're calling to get "enterprise support" from Microsoft and not even the engineer you're on the phone with can explain why your configuration is failing.

Microsoft might have had its place. On the desktop. 5-10 years ago. But for environments where you need uptime? No. No. No.

EDIT: With regards to your video management system, does it have to be broadcast grade? Mine does. The FCC doesn't let you explain away fines for not being on the air "because the Windows box crashed".