Resolved, 2:05 P.M. Eastern:
Though Blackboard have not yet issued an update regarding the Collaborate outage, the Collaborate system appears to be back online and working normally again.
At this time, the Blackboard Collaborate (Online Rooms) web conferencing system is not available. Attempting to enter a Collaborate session by following a Join link within D2L returns the following error message: "Unable to get Join link for this meeting".
Blackboard technicians are working to correct this problem, but they are not able to provide an estimate on when Collaborate will work again.