Incoming messages show as draft

We have a issue with some emails, and its very strange. We receive an email from someone outside our organization and it changes to draft. The mails in question are sendt to a mailbox where several users have access.

First we upgraded our exchange server to 2013. Then we upgraded some of the outlook clients from 2010 to the 2013 version. Still there are no change. I have searched the web and some people say its is a problem regarding antivirus, but we uninstalled the antivirus on a client but the problem still exist.

Now, is there any other ways to go about this problem?
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Tomas Bjervedsenior consultantAsked:
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strivoliCommented:
Does that happen even if you access the mailbox via webmail (OWA)?
Is there any AV (AntiVirus) running on the Exchange Server?
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Tomas Bjervedsenior consultantAuthor Commented:
There is no local antivirus installed on the Exchange server.

The email get scanned with Trend ScanMail for Exchange 11.0.0.1251.

The clients have ESET antivirus installed (I have found other articles online claming that ESET might be the problem, but I have not found any articles confirming this, or giving a fix for this.)

When we open the mail in OWA we also see that the mail has changed to draft.

We are now setting up a couple of new computers withou any local antivirus and creating a new shared mailbox that will only be accessed from these copmuters. Then we will try to replicate to problem.
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Tomas Bjervedsenior consultantAuthor Commented:
The antivirus might  have been the issue, this is not confirmed. But it is what other organizations had in similar.
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