[AbidingSeraph]

We are having the exact issue as well. We are running exchange in a resource forest with all accounts disabled (except a few service accounts) too. We have a ticket open with RIM currently for this issue, but they haven't gotten back to us yet, and its been a few days. When I first spoke to RIM about it, they gave me the same kb article and instructed me to remove msExchMasterAccountSid attribute, to which I said "are you crazy"?? They said they will get back with me. I will update you when I hear back.