I have just started our Exchange 03-07 upgrade and am experieincing an issue. Currently all we have is one exch07 server running with public fodler replica's setup and 3 Exchange 03 servers. I have moved one test user over to it to verify that mail flow and OWA work. In our Company there are 2 users that have admin rights over all the mail boxes. Myself being one of them. After the install of Exchange 07 both of us can not open another users mail box. I have verified my permissions and I am listed as a Org admin in Exchange 07 but every time I try to open another users folder I get the error that I can not expand the folder. I am adding them to my outlook via account settings.