IMac can no longer open .jpg .jpeg & other media files sent from PC?

I can no longer open .jpg photos & media files sent to my iMac from my wife's PC through Outlook email. I get an error message saying the item cannot be opened. All other recipients have no trouble opening these attachments. We have tried numerous fixes suggested by Apple chat sites but to no avail. I suspect an OS update around December 2010 has caused this problem on not just our machine but thousands of other iMac users & Apple is ignoring it. Why isn't Apple addressing this huge issue?

Likely, because there are millions of Mac users, and not everyone is experiencing this issue.   Until it happens to all Mac users with a specific system, it will be very difficult to isolate the cause.
You can sign up for a free online developer account:
http://developer.apple.com/
And you can post here your bug report:
http://bugreporter.apple.com/
Attachments may need to be encoded a specific way with Outlook to be readable by Mac OS X Mail.
You can also try reading those messages with Thunderbird, or another Mac e-mail client.  To find other Mac e-mail clients, search the software search engines here*:
http://www.macmaps.com/macosxnative.html#NATIVE

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