delivery of some internal mail items delayed

Hi.

I have just setup a new domain, with 2008 R2 DC and a separate 2010 exhchange server. The existing PCs were removed form the old domain and joined to the new. Everything going ok so far.

I had a complaint from a user that some emails which were destined for internal users were not arriving.  When I went to investigate, sure enough there were 17 internal messages waiting in the queue called mailbox database 0061177055 for MAPI delivery.  There's nothing in the last error column.  When I ran the mailflow troubleshooter, it says that there are no mail queues backing up even though the messages are in there.  Then 20 minutes later tey will have been delivered successfully.

What's going on here?

thanks
CruthinAsked:
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CruthinConnect With a Mentor Author Commented:
Ok.  I have disabled the virus scanning of the exchange store which is on by default and the issue hasn't re-ocurred since.  I'm gonna leave it for another week before I'm satisfied.
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MarkMichaelCommented:
Is this happening to certain user accounts only?
Have you tried to emulate the behaviour at all to check for any patters?

If its down to a user account as such, its most likely an account issue or mailbox issue.

If it's system wide, its most likely a server issue specifically connecting to a global catalog or perhaps a firewall issue on the server?

Are there any checks you have done?
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CruthinAuthor Commented:
No other checks other than the exchange troubleshooting tools.  I am trying to catch it happening to see if i can notice any patterns, but I'm not on-site very often.

When I do, I will post back.

thanks
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CruthinAuthor Commented:
It seems to be a system-wide issue.  I also see this event cropping up:

The execution time of agent 'Conversations Processing Agent' exceeded 90000 milliseconds while handling event 'OnPromotedMessage' for message with InternetMessageId: 'Not Available'. This is an unusual amount of time for an agent to process a single event. However, Transport will continue processing this message.
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CruthinAuthor Commented:
Yep. I'm quietly confident that that's the issue resolved. The Antivirus software is AVG.

Thanks for your input anyway.
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CruthinAuthor Commented:
The scanning of the exchange store was causing the delays.
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