Like many of you, I use the Missing Sync from Mark|Space to sync my Palm Treo with my Mac. It blew my mind, though, when I upgraded to the Treo 700p that I would have to install Palm Desktop in order to install VersaMail (which comes free with the Treo). It turns out that the installer files are just buried within the installer package, and you can extract them without having to install Palm Desktop. This may work with other Treos as well, however, I have a Tre0 700p from Verizon. Here's how I did it:
Put the Install CD that came with the Treo 700 into the computer, but don't run the installer. Hold down the Control key on the keyboard and click on the file called PalmSoftware.pkg within the CD. Choose Show Package Contents from the pop-up menu, then open the Contents folder. Drag the file called Archive.pax.gz to your desktop and wait for it to copy over, then eject the CD.
Double-click Archive.pax.gz on your desktop and the computer will decompress the file. You will end up with three files: Archive.pax.gz, Archive.pax, and and a folder called Archive. Delete the first two, then open the Archive folder and navigate into Applications » Palm » Add-on » English » VersaMail.
Now go to MissingSync and click on the Install button. Select all of the files in that VersaMail folder and drag them to the space in the MissingSync where it says Files to install in internal Memory. Now sync and you should be all set. No Palm Desktop to get in the way of the much-superior MissingSync.
Mac OS X Hints
http://hints.macworld.com/article.php?story=200701310918020