You may still be able to use your adapter... you need to get rid of the manufactuer's driver off your system so that it won't try to load that anymore, then edit the bth.inf file like it explains in the instructions, then it should pick up the adapter.
I bet all adapters will not work under the native bluetooth drivers though, but many people have had success. My USB adapter was a kensington.
The neat thing about having your berry bluetoothed to your computer is that it will use your connection to Desktop Manager to transfer data instead of the cellular connection. for example, i'm in an I.T room with thick walls where there is no signal. my berry still picks up all the emails while in this room thanks to the bluetooth. when i walk out of range, i'm within reach of the cell towers...
History: PB32, 9800, 9700, 8310, 8700, 7100r, 7780, 7280, 6710, 957, 950