- You have a mixed Microsoft Exchange Server 2007 and Microsoft Exchange Server 2010 environment. The Exchange Server 2007 server has Update Rollup 5 for Exchange Server 2007 Service Pack 3 or a later update rollup installed.
- User A is an Exchange Server 2010 user and user B is an Exchange Server 2007 user in the mixed environment.
- You grant user A the Full Access permission to user B’s mailbox.
- User A logs on to his/her own mailbox by using Outlook Web App and then tries to open user B’s mailbox.
User host address: HostAddress
Exception type: Microsoft.Exchange.Data.Storage.StoragePermanentExceptionException message: Cannot open mailbox /o=OrganizationName/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Mailbox.