No Support for PPC 2002 in Windows Vista
Yes, you read that right. Most PocketPC 2002 are no longer supported in Windows Vista. And since you don't have access to ActiveSync anymore (Windows Vista uses Sync Center instead of ActiveSync for all external device partnership), you may lose support for nearly all other older devices, too.
But if your PPC have memory extension slot, you can buy those memory cards and sync it using card reader OR the PPC itself (provided that it exposes methods to manipulate the memory card).
What Windows Mobile version are you using?