I am currently running Outlook:Mac 2011 and have been running it for quite some time without too much problems.

About two months ago I started noticing that attachments coming from various senders were being downloaded as per normal and upon opening them up an error would come up saying "The file "blahblah.pdf" could not be opened. It may be damaged or use a file format that Preview doesn't recognise."

Now, the only email address that it effects is my @mac.com email account, all my other email addresses opens the exact same attachment without any problems when I forward the email from my @mac.com account to the other email address via my phone. Interestingly the exact same attachment that won't open on my mac opens on my iPhone.

There has to be something wrong with Outlook to be doing this. I have tried rebuilding the database but this did nothing.

I would be very appreciative for some help here as having to download the attachment on my phone to then forward it just to read it is terribly inefficient!

Hi,

This is the forum to discuss questions and feedback for Windows-based Microsoft Office client. Since your query is directly related to Office for mac, I would suggest you to post in the forum of Office for Mac, where you can get more experienced responses:

http://answers.microsoft.com/en-us/mac/forum/macoffice2011?tab=Threads

The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.

Regards,

Ethan Hua
TechNet Community Support