We have several clients running exchange 2003 sp2. These clients are also running AVG for exchange. Just recently, several of the clients are having issues where outbound mailflow shuts down. The mail just backs up in the queue. We tried disabling the AVG 8.5 for exchange plugin to see if that was the problem however that didn't release the mail. THe only way we can get the mail to release is by doing an IISRESET. After that the server runs fine for a while and then we have to do another IISRESET eventually. AVG's support is worthless so I haven't really talked to them as of yet.