Where does Windows Vista fit among many of the PC-based operating systems of today and the last couple of decades? With Beta 2 running on multiple test units, I feel comfortable predicting that Windows Vista will not outpace Mac OS X Tiger for overall quality and usability. It’s hard to beat Apple’s top-notch GUI design grafted onto an implementation of Unix variant BSD. Mac OS X has excellent reliability, security and usability. That isn’t to say that the user interface wouldn’t gain if Apple adopted some other best ideas of the day, but Apple has the best operating system this year, last year and next year. It’ll be interesting to see what the company delivers in its 10.5 Leopard version of Mac OS X.