Handspring has updated their technical support page with information regarding Windows 2000.
"On February 17, 2000, Microsoft™ released a new operating system called Windows 2000™. The support for USB in Windows 2000 is based on a new USB architecture. Given this, the drivers that are included with the current version of the Palm™ Desktop that is included with the Visor™ handheld, are not compatible with Windows 2000. The new USB drivers to support synchronizing the Visor with Windows 2000 are currently under development. Handspring will post an updated version of the Palm Desktop that includes Windows 2000 support in March 2000."