Hello,
We have many shared resource rooms on our exchange 2013 server. We have 1 server with 1 database. A couple of them won't open correctly in outlook. If you go to them in exchange management you get the error message Cannot open mailbox /o=priv1/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=EXCH/cn=Microsoft System Attendant.
Any suggestions?