Were using Exchange Server 2K3 and noticed that messages seemed to be stuck in the Local Delivery queue. The first indication that something was wrong is when we got the "16 meg limit error" for the Mailbox Store. We did a backup the entire First Storage Group and the did a maintenance defrag. Afterwards, the messages stop flowing. All stores are mounter and all services are running. I restarted the server a few times and still the same thing. I did a force conection, unfreeze ; tried freezing all but a few messages to see if they would trickle in - nothing working. Now, I am also noticing a few messages being held up in some of the Internet Mail SMTP connectors. I checked and I don't think we have SP1 on the server. Any suggestions?