A few days ago I posted in "Help Me" if anyone knew how to use Palm desktop Software to HotSync with a Handspring Visor Deluxe. Though there was a comment "not possible" I finally got a reply from Handspring Online-support which is quite interesting:
Dear Handspring User,
Thank you for your e-mail.
At this time there is only a Beta Version that is available for the Mac OS X. Once the software becomes available it will be posted on the web site.
Handspring Technical Support