I thought that students could not subscribe to Blackboard forums but had to eat my words. There is a forum setting to allow students to subscribe that they can then opt into (I don't think we are using Vista).
One interesting thing about Blackboard, as compared to Moodle and lots of other forums, is its poor integration between identity and interaction. Students can create an identity in Blackboard but it's quite hard work for others to see it (unlike the name click profile link in Moodle). CLicking a name in Blackboard forums brings up an email.
I am not sure What is a 'corperate blackboard onslaught'? but I think this might have been an earlier manifestation http://www.google.co.uk/search?hl=en&q=noone+ever+got+sacked+for+buying+IBM&btnG=Google+Search&meta=