SAN FRANCISCO, It shouldn't be difficult to spot Kevin Browne among the thousands of people at Macworld Conference and Expo 2001, Apple Computer's annual gathering for its Macintosh line of computers. He's the guy with two laptops -- one a Mac, the other a Microsoft Windows PC. Since taking over as general manager of Microsoft's Macintosh Business Unit (MacBU) in 1999, Browne has quickly learned how to maximize the two computer platforms and build bridges between them -- not to mention stay on a first-name basis with both Apple CEO Steve Jobs and Microsoft Chairman and Chief Software Architect Bill Gates. In many ways, Browne is an evangelist with two religions -- and two parishes. He leads a crew of 200 Microsoft developers that creates a growing array of software for Macs. He also spreads the word about these products to the growing number of Apple diehards who are realizing the benefits of Microsoft software and hardware built expressly for the Macintosh platform. Today, Browne goes before one of the largest-ever gatherings of Apple devotees as the first Microsoft executive to offer a keynote speech at Macworld. He expects to surprise many attendees at San Francisco's Moscone Convention Center. "There is a big percentage of Mac users who are aware of some of the things Microsoft does on the Mac platform," Browne says. "But I don't know that anybody outside Microsoft is aware of everything we do on the platform. There is software. There is hardware. There are new products coming out. There is Microsoft's investment in products for the new Mac OS X platform."