I have a user that sends out meeting requests frequently. On occasion, the meeting request will get stuck in the queue. Additional queue information states "Unable to open message for delivery". The user is using Outlook 2007. We are using Exchange 2003 SP2 and Server 2003 SP2.
Here are the steps I've tried:
1. Enabled Message Tracking. This states "message routed and queued for remote delivery"
2. Applied hotfix KB938650 and the appropriate registry edit.
3. Downgraded the user temporarily to Outlook 2003 to try to isolate the issue, but the issue still occured.
4. Disabled anti virus.
5. Tried Outlook 2007 with no updates and all updates to rule out an update causing the problem. Same issue occurred.
Anyone have any additional troubleshooting tips or known resolutions to this problem? Any help would be much appreciated!!!!!!