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My Dell Inspiron 9400 originally shipped with Windows XP, but came with a free upgrade to Vista. It also has a built-in Dell TrueMobile 355 Bluetooth + EDR module, so I decided to get a Bluetooth mouse to use with it. One slick advantage of having this built-in Bluetooth adapter is that a Bluetooth mouse can connect to it directly and there is no need to plug in an external USB Bluetooth 'dongle' for the mouse.
My mouse is a Microsoft Bluetooth Notebook Mouse 5000. Every once in a while, I had to reset the Bluetooth connection to get my mouse to re-connect, or turn the mouse off then back on, but it was never frequent enough to complain about it...