I have noticed an increased problem with messages that are seen as corrupt by Exchange 2003. The majority of the items seem to be meeting related and generated by or updated from clients with Outlook 2007, this applies to external meeting requests as well. . Most internal clients still have Outlook 2003. Running Exchange 2003 SP2 Standard. Backup exec also keeps flagging calendar items as corrupt (from 2007)and unreadable and have also gotten messages stuck in the outgoing queue with :
Event Type: Warning
Event Source: MSExchangeTransport
Event Category: Connection Manager
Event ID: 4006
Message delivery to the host "ip address" failed while delivering to the remote domain 'domain.com' for the following reason: Unable to open the message for delivery
Behavior matched symptoms in KB 938650 ( http://support.microsoft.com/kb/938650/en-us
But the files in the hotfix are older than what I'm running so I did not apply. I've changed the delivery mime for certain domains to plain text which seems to have helped but am wondering if this is a 2007 compatability issue. Pretty sure the external domains I'm haveing issues with are running Exchange 2007. Called Microsoft and they had me run ISINTEG on my stores and no problems were found. Still want me to migrate to a new store which if it does fix the problem I don't think it will be permanent since it seems to be created by users running 2007. I think their next response will be upgrade exchange to 2007. Not the kind of "fix" I'm looking for. Of cource this problem is sporadic and not always repeatable. Also running Symantec Mailsecurity.
Anybody have the same problem or know of a fix?