Why do attachments not appear in Outlook on Exchange 2007?

Hello,

     We are running Exchange 2007 SP3, rollup 3v2, on Windows 2008 SP2. We are experiencing an issue where users from other systems send us emails with attachments such as PDF files, and they do not appear in Outlook. (Using Outlook 2010 by the way.) The sender of the mail indicated that an attachment was there but it did not appear to be. We found in investigation, that if we logged into Outlook Web Access that the attachment actually is there, and can be accessed from there. It would seem to me that in such a case, where OWA shows no issue that this is an Outlook issue, but investigating issues with Outlook has brough forth no resolution. Some attachments (usual example is PDF files) do appear in Outlook and others do not. I suspect that it is inline attachments that are not appearing. Not completely sure. If others are experiencing this or have seen this, I figure they may be able to offer help while we are investigating this. Thanks ahead of time. If anyone suggests updating or any patches, please let me know if you have seen this actually fix the problem. Thanks!
gs-rhoAsked:
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gs-rhoAuthor Commented:
Sorry, not sure about the PDF files as inline attachments. Someone said that to me. Can't confirm that. All I have seen is that some PDF files are getting through to Outlook and some are just not there. But all are there when you look in OWA. Thanks.
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Gary ColtharpSr. Systems EngineerCommented:
some endpoint protection antivirus apps put plugins in outlook to scan mail and will remove any attachments they deem dangerous.
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gs-rhoAuthor Commented:
Good point. We do have Symantec Mail Security installed on there. It is either the latest, or next-to-latest version. However, when it removes an attachment, it notifies the user with a message. We also have checked for logs about any removals, and there are none with these frequent removals of PDF files. At the same time, it is removing virus-laden files and logging the event.
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gs-rhoAuthor Commented:
This was solved by installing SP3 rollup 5. Too bad we've gotten to the point of finding the rollups hard to trust.
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gs-rhoAuthor Commented:
This was what actually solved the problem
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