I migrated about 50 accounts from Exchange 2003 to 2007. All mailboxes migrated over perfect with no problem.
1 thing I noticed is that MY email box is in the "Disconnected" area.
My email works perfectly. OWA works perfectly, no issues with the account at all.
But it still stays DISCONNECTED and when I try to connect it, It doesn't show a Existing User or Matching user when I do a search. It doesn't even load the folder in my AD Forest that has my account in it.