What Happens When the Lync Server's Domain Controller Shuts Down? #Lync

I've already wondered what stops working when the the Lync Server Domain Controller is shut down underneath a Lync implementation. Of course no adding or changing users, but what else? In my lab I decided to just shut down the Domain Controller and check! Here are my findings.

What Still Works?
-Changing presence
-change IM subject
-peer to peer IM, Calling, video
-Send File.
-Activityfeed is updated

What Stops Working:
-conferencing service does work (whiteboarding as shown above)
-you will not be able to download the Topology (no surprise there ;-)

If you have anymore input I'd be glad to hear your comments.