This is a bit of a specific topic, as it only affects people who are trying to use the MTA in their cluster (for mail delivery back to 5.5 in mixed-mode, or to foreign systems not connected with SMTP, etc) * AND * have >4 nodes in their cluster. ...

Rod posts today about the strange (and sometimes frustrating) behavior where outbound SMTP connections from an Exchange cluster originate from the host IP address rather than from the virtualized IP resource associated with the Exchange Virtual Server...

KB article came out the other day on this sort of obscure scenario, but interesting to know about in any case: KB.896617 : “ The Exchange Information Store service stops responding when the Exchange Information Store service is shutting down or the Exchange...