Microsoft® Exchange Server 2010 Inside Out

Changes in Exchange 2010 SP1

The Exchange transport engine is pretty solid and its basics did not need much improvement in Exchange 2010 SP1. Microsoft therefore concentrated on fine-tuning transport in three areas:

• SMTP load-balancing and failover: Making sure that Exchange balances connections most efficiently when an SMTP server fails.

• Submission queue resource monitoring: Making sure that a server that is under stress is not placed under further stress by having to deal with new message submissions. This is a variation of the pressure backoff work that was first introduced in Exchange 2007.

• Mailbox delivery prioritization: Making sure that the general flow of messages isn’t slowed down by the email equivalent of slow-moving trucks in the outside ...