Old messages suddenly delivered

I have had 2 reports of the past month or so where a user suddenly receives mail from a month or more ago. These do not appear to be old messages form the "I have already seen them" point of view.  These seem to be unseen messages that are a week to a month or so old that are suddenly delivered. I am not sure if this is an Outlook issue or an Exchange issue. It is Exchange 2010 and Outlook 2010.
dustaineAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
You need to look at the headers of the messages and message tracking to see when the message went through Exchange.
A common cause is AV software scanning something it shouldn't be, hangs on to the message and a server/service restart releases the message.

Simon.
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dustaineAuthor Commented:
I will check the header info, but there has not been a server restart in about a month and the release did not coincide with that.
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dustaineAuthor Commented:
Will this happen even if there is nothing showing up in the queues?
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Simon Butler (Sembee)ConsultantCommented:
Yes, because the messages aren't visible to Exchange until the AV software releases them.

Simon.
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