At MDE, AOL instant message accounts were blocked, but you could get on with Yahoo!; at DNR, Yahoo! IM accounts are blocked, but you can get on with AIM. Still can’t get onto Lync, something got messed up in my account on the way to DNR apparently.
Also, haven’t been able to link to the shared drives on the M$ servers, but ran into someone this morning who is also a Mac-head, and she said that she had some workaround to get to the drives. Hope that is true.