Problem with email content on an Exchange mailbox

We have a single Windows 2011 SBS running exchange. We are also using Outlook from the Office 2007 product.

We have a mailbox which several users have access to, and send on behalf rights for.

Just on one mailbox we have a problem where mail arrives OK, and looks perfect, but some time afterwards the content dissapears totally, both in the preview and full read situation. All of our other mailboxes work fine, so its just this one we have problems with.

This happens on all workstations that have access to this particular mailbox.

Can anyone suggest how go about diagnosing and resolving this situation?

Any advice welcome.

Thanks.
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nigelbeatsonAsked:
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Cris HannaSr IT Support EngineerCommented:
Any chance the POP3 connector is in use?
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Jian An LimSolutions ArchitectCommented:
with exchange 2010, you can turn on mailbox auditing

set-mailbox <user> -auditenabled $true

then you cna go to ECP to view the non-owner mailbox access report to find out what's going on there.
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nigelbeatsonAuthor Commented:
no the pop3 connector is not in use.

The messages arrive fine, its just that on this mailbox only, the content just disappears, ie the message is still listed in the mailbox, but the preview and full opening of it is just blank.

This happens from various locations ( a few users have full access to this and send as rights) and it is also blank when logged in using OWA from a remote location,
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nigelbeatsonAuthor Commented:
I read an article which suggests that AVG can do this, and we did find this on one of our computers involved. We have removed the AVG add-in from outlook, and will let you know how we get on.

Thanks to all.
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nigelbeatsonAuthor Commented:
Thanks to all. I found that removing the AVG addin from Outllok resolved this issue.
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