The fascinating relationship/rivalry between Microsoft and Apple was ratcheted up a notch this week. At Apple’s annual World Wide Developers Conference, CEO Steve Jobs announced their Apple-exclusive web browser, Safari, will be released for Windows XP and Vista—and will be up to twice as fast as Microsoft’s Internet Explorer, and 1.6 times faster than Firefox 2. The move is seen as part of Jobs’ business strategy to broaden Apple’s presence in the browser market, of which they only have 5 percent, compared to Microsoft’s whopping 80 percent. Curious? A test version of the browser is available at Apple’s web site. This writer will give Safari a test run with Windows Vista and report back soon…