I use Retrospect v8.5 to back up our Exchange 2013 server. The mailbox database on the server is about 154GB. About two weeks ago, the backup started taking 12+ hours to run. It started throwing up an error "Create MAPI session failed: Exchange MAPI/CDO may not be properly installed".
Retrospect said the problem exists with our Exchange server. I'm not sure where to start troubleshooting something like this. Can anyone help?