I use ACT! for Palm 3.0 with Palm Desktop 4.1 on Vista and it works fine. I have downloaded and installed a number of programs. They work fine. Have you actually run 4.1 on Vista and with ACT! for Palm 3.0?
How do you get the Act for palm OS onto your PDA/smartphone? Supposedly, and I can attest, that you can't use Quickinstall on Vista. You need 6.2 DEsktop to download. Does Act for Palm OS 3.0 work with 6.2?