Cannot open some PDF Files e-mailed

We have installed a new Small Business Server 2008 about 3 months ago. We have noticed that  we are getting the following error on some PDF attachments:"There was an error opening this document. The file is damaged and could not be repaired.". This does not happen to all PDF files sent. I even received an e-mail with two PDF's attached to it and one opened and the other did not. We are having the problem with all users on the network.
Brian32003Asked:
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jfromanskiCommented:
Probably upgrading to the latest version of Acrobat Reader will fix it. Also try
"The file is damaged and could not be repaired." PDF
in Google, you will find many specific solutions
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HiltonParkCommented:
Had a similar problem with and EU on a SBS 2003 Network. Eu had acrobat reader V7 Changed it to Acrobat Reader V5 all works Fine now.
 Acrobat V6 did have problems which version are you using?
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QEMS2Commented:
Try foxit reader instead of acrobat reader all free and runs a lot smoother

http://www.foxitsoftware.com/pdf/reader/
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Brian32003Author Commented:
I am on the latest version of Adobe reader. This problem is occuring to all users on our network.I do not think that the problem is comming from adobe. The problem has just started to occur after we upgraded our network.
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jfromanskiCommented:
What's going on if you save such attachement and try to open it from disk?
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SubsunCommented:
I had faced same kind of issues with TCP Chimney Offload feature in Windows Server 2003 SP2 but not sure about win 2008. You may try disabling TCP Chimney Offload in Windows Server 2008 and see if the error stops.

http://support.microsoft.com/kb/951037
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Brian32003Author Commented:
When I save the document to my disk I still have the same problem. I performed the following test as well. I had a document sent to my hotmail and also to my work e-mail. The document had 2 PDF attachments.

The document's sent to my work e-mail: one of the document will open and the other document will not.

The document sent to my hotmail will both open. I am opening the hotmail document through my outlook 2007. If I forward these to my work e-mail. I have the same problem as listed above.

I am going to test the Chimney offload feature. I will update after I test it.

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SubsunCommented:
Did you ever try to open the attachment from OWA before receiving it in outlook? If not try that. By this way you can confirm whether the issue is with client or server.

You should also suspect the sender side. Is this issue happens if the users send internal mails with attachment?
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Brian32003Author Commented:
I have tried to open the document in OWA before receiving it in outlook and even saving it to my desktop and opeing it from OWA and it will not open.


The problem is for all Client computers running office 2007.

The problem is occuring from multiple senders and mulltiple companies. If the problem is on the senders side then it would also not open in my hotmail. The problem problem seems to be occuring on documents such as invoices, registration keys, etc..
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Brian32003Author Commented:
I have also checked and Chminey offload is already disabled on the server.
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SubsunCommented:
If you are sure that the attachment is getting corrupted even after downloading to outlook then we can void the client end issues.
Do you have any third-party SPAM/AV filtering solution for your exchange?
As a last try please paste Get-TransportAgent output
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Brian32003Author Commented:
Thanks for your help. Your comment above led me to review the transport connector. We are using ASSP as a SPAM Filtering software which has been in place for some time. I changed the authentication type on the receive connector and it fixed the problem.
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Brian32003Author Commented:
Although, I was not give the direct answer I was pointed in the proper direction which helped to solve the problem.
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