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PDF opens on iPhone but not on PC

I am having problems opening pdfs emailed to me from a colleague. They open fine using DocsToGo on my iPhone, but if I try to open them on my PC (using either Acrobat Reader or Acrobat Pro Ver 9.3.1 on Vista) I get the message "Acrobat could not open <File Name> because it is either not a supported file type or because the file has been corrupted (for example, it was sent as an email attachment and wasn't correctly decoded)."

I suspect the issue is not corruption but rather a compatibility issue, as the pdfs were created on an Apple Mac using print to pdf from a CAD program (don't know which one, or which version of acrobat is installed on the originating Mac).

Can anyone advise whether there is a multi-platform reader/converter that is more tolerant of different Acrobat versions/platforms?

Thanks

NAKBrooks

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After investigating further this seems to be an Outlook 2007 issue. When I open or save the pdfs from Outlook they have no content (0 bytes size). However if I forward the email to another PC running Outlook 2003 on XP the enclosures open correctly on that PC. If I zip them and send them back to the first (Vista/Outlook 2007) PC I can open the zip file and view the pdfs on that PC without problem.

Is this some kind of anti-malware protection in Outlook 2007? If so I'm not sure why it allows me to open some pdfs and not others (it is significant that it only seems to be the pdfs generated from the Mac CAD programme that it won't open).

Not an urgent issue for me now as I have the workaround, but would be interested in knowing the answer.

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