I've just managed to migrate my organization from Exchange 2003 to Exchange 2010. Almost everything is working! One thing is not;
When the big bosses secretary sets up a meeting for him, the meeting goes onto her calendar too. It didn't used to do that when I had Exchange 2003. Unless she had specifically invited herself, the meetings she arraigned for other, did not appear on her own calendar, now they do and they are making her calendar useless.