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There has been tons of help on this issue.
The official word is, ZIP the PDF's before emailing or post them to a website and email a link to them. Some email clients use encoding (Adobe can't do anything about that part) and when the file is decoded at the other end, it is corrupted. It can happen to some of them or all of them.
Thank you for the expeditious response. I apologize if my post was a duplicate, but I thought I had researched rather thoroughly before posting, and never found a definitive anwer.
It seems after trying to open this corrupt file for weeks, I have finally recovered it. Since you said the problem was with the e-mail client, I tried opening with Sun Java Communications Express instead of Mozilla Thunderbird or forwarding to Hotmail. Now the file opens!
I don't use Hotmail but have heard around here that they are one of the biggest offenders. It used to be AOL but I think they may have changed their encoding (or gone out of business. I haven't received a CD from them in years. )