NokSync is a new freeware extension for Thunderbird email client (for Windows only) that allows you to synchronize contacts on your Nokia S60 mobile device with the Thunderbird address book using Nokia PC Suite via Infrared, Bluetooth or USB cable connection. This is unlike my previous solution to sync wirelessly using SyncML.

Here is how the extension works:

-reads one or more Thunderbird address books
-reads the phonebook in a NOKIA phone (using cable, infrared or bluetooth connection)
-compares the two, and suggest updates to bring them into synchronization
-lets the user change the suggestions to synchronize exactly as he wishes
-updates contact information in Thunderbird address books and the NOKIA Phone accordingly

Download here