You might want to look at Pimlical (www.pimlicosoftware.com
I'm using that to sync both an old IIIx and a relatively new Pal Pre to Palm desktop 6.2.2.
I e-mailed Pimlico back in January. Their reply to me reads, in part:
If you are using 64-bit Vista, you can only sync via Bluetooth. If you have 32-bit Vista, you should be able to get at least part of synching working
with the V-6.2 Palm Desktop although you may have a problem with the contacts database as the T3 has an older format for the database.
I have 32-bit, so don't have to bother with Bluetooth, but the part about database formats sounded a problem. Do you mean that not only can you sync, but the 6.2 Desktop will correctly show you the contents, let you edit them, and sync back to the PDAs?