Wot MM said. It's certainly a USB connection, not RS232. The Nokia PC Suite as supplied then worked a treat. The OVI suite which replaced it was clunky & almost unusable, and the present Nokia Suite is a bit better but worse than the first one. But if you use the correct cable - still avail on ebay - you should be all right.
However, the 6310i does have a bluetooth connection; if your computer bluetooth is in the mood to talk to it you don't even have to buy anything.
Worth a try?