Outlook 2010 pdf attachments arriving as html in message body

Out of 12 users with basically identical setups, one of them is having the issue. Anyone run into this issue? Exchange server settings & AV are verified the same for every user.
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sunstreamnetworksAuthor Commented:
Sample from the message body:

Content-Transfer-Encoding: base64
Content-Type: application/octet-stream;
Content-Disposition: attachment;
Hi sunstreamnetworks,

1. Can you verify whether this appears in the users OWA? Or does it appear as an attachment?

2. Have you created another profile in Outlook 2010 for the user in question?

3. Is Outlook and Exchange 2010 full patched and up to date?

sunstreamnetworksAuthor Commented:
Thanks for you help & suggestions, answers below.

1) It is the same in OWA, no attachment.
2) I have not tried to create a new profile
3) Both are fully patched & updated
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My hunch is your AV, its always a third party product which causes Exchange or Outlook to behave this way.

Have you excluded your AV on the Exchange server to exclude certain directories? http://technet.microsoft.com/en-us/library/bb332342.aspx

Can you disable AV on the affected client machine as a test, and possibly disable the Outlook AV protection, if enabled: http://www.msoutlook.info/question/20

Please advise how you get on.
sunstreamnetworksAuthor Commented:
Hi Netflo,

Apologies for my delayed response.
Confirmed AV doesn't seem to be causing the issue, I completely disabled it on both sides with no luck. Is there anything else you can think of that may be causing this? The last step is to create a new profile, which I am hesitant to do until I feel i've exhausted all other options...
Thanks for your help!
A new profile should be an easy one to test as well. Going back to your AV solution, when you disabled it on your server, did you reboot it to ensure that all resident services are off?

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