I recently upgraded two Exchange 2010 servers that are both in the same DAG from SP1 to SP3. The upgrade seemed to go fine, but we are now finding that Out-of-Office messages are not being sent and Moderated Mailbox messages are not being sent. These facts are only true when the mailbox databases are mounted on EX01. If I move them all to EX02 I do not see those problems.
After a bunch of digging I’ve found that the “Microsoft Exchange Mailbox Assistants” service on EX01 is failing to start. It is set to Automatic, and does not start on bootup. When I attempt to start it manually I get an “Error 193: 0xc1” This service is configured exactly the same way as on EX02, though on EX02 the service is starting properly and when the mailboxes are mounted on EX02 we do not see these problems.
This was not a problem for either server prior to the upgrade to EX2010 SP3
Has anyone seen this before? Can anyone suggest where I might look for a solution for this?
I’ve searched the usual sources and I’m only finding a couple of articles that refer to vaguely similar issues with Exchange 2000 or 2007.
Thanks for your input,