Users who are planning to install Windows XP Service Pack 2 and wish to use the built-in Bluetooth stack instead of TDK's Widcomm drivers may need to update the device's firmware upgrade first, to allow Windows to properly recognise the device. This is not required if users plan to keep using the TDK software instead of the new Windows built-in stack.
The update is part of a FAQ TDK posted with answers to most common questions regarding the SP2 update. The company also says that users who want to keep using the Widcomm software already installed don't have to change anything. It also give instructions on how to switch from the SP2 Bluetooth stack to TDK's Widcomm stack, and vice-versa.
If you want to decide what software to use, take in consideration your needs, and what's provide in each driver. For example, TDK's Widcomm provides the following profiles:
Personal Area Networking (PAN and LAP). Enables IP connections over Bluetooth.
Hard Copy Replacement Profile (HCRP). Enables printing
Human Interface Device (HID). Enables Bluetooth keyboards, mice, and joysticks
Dial-Up Networking (DUN). Enables Bluetooth mobile phones to work as modems.