Here is the only place you can get the original mail.prc file for palm os.

I was using Eudora to syncronize my outlook inbox but it was such a large file (400k+) and didnt work with today .
I downloaded it and now i get outlook syncronized with my treo 600 and the file is only 50k PLUS works with today so after I syncronize in the morning before work, on the train I can read my emails. I belive this file will be taken down soon so download soon.

Click on the word HERE highlighted.

This is a direct link i think