Update:As PalmOne has now released the Mail application for Sprint Treo 600, so please download the newer, official version from Handspring.com instead
As promised, the Treo 600 Mail Installer is now available for download. You can get it at the address below:
Instructions for installing: (when on computer)
1) Copy the link to your clipboard
2) Go to http://messaging.sprintpcs.com/ and send the URL for the program as a text message
3) Open the URL on the Treo 600 and the program will download automatically
OR HotSync Install the PRC file (after downloading it to your computer) and then run the new program there.
This is a self-expanding installer that will load all the necessary PRC and PDB files into the Treo 600.