It will not support the software on the CD that came with your 8300 device, you would have to go to AT&T and download it from there if you are considering purchasing a computer with Vista OS.
I have an 8800 which I downloaded the software from AT&T to my Vista OS desktop computer and the software launched fine, but as of now it has not recognized my device, whereas the desktop software works flawlessly on both my laptops with XP OS
I am still working on how to get the BB Desktop to work properly.