I have conexistance environment with Exchange 2007 and Exchange 2013. Out of about 1200 users we have 25 test users in the 2013 environment. The problem we are seeing is when a 2013 mailbox has "Full Access" to a 2007 mailbox and tries to connect
to that mailbox through OWA 2013 the connection always fail. I can attach the mailbox in Outlook with no problems but cannot open that mailbox through OWA 2013. Any thought?
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