External Email is not being delivered. Internal email works fine.
We have 2 exchange servers. An old Exchange 2003 server which only runs SMTP, and a new Exchange 2007 server that holds the information stores.
The SMTP server is showing EVENT ID 9175 errors every 30 seconds. The mailbox stores are properly mounted.
The MAPI call 'OpenMsgStore' failed with the following error:
The Microsoft Exchange Server computer is not available.
ID no: 8004011d-0526-00000000
The only thing I can see that is wrong is that I can't seem to find the System Attendant Mailbox, or AD item.