He does? How?
Microsoft was happy to place bets on every system they could. Bill Gates didn't bet against anyone. He placed lots of bets on lots of systems, knowing that one would work out. The IBM PC is what made their fortune. But the bets they placed on other systems were already doing very well for them. Including on Apple.
The Microsoft-Apple relationship began in 1977 with Microsoft introducing Applesoft BASIC and later licensing it to Apple. Microsoft SoftCard followed in 1980, enabling Apple machines to run to programs designed for the CP/M. Sure, there was the infamous MS-DOS deal with IBM. But in the same time period Steve Jobs visited Microsoft to demo early prototypes of the Macintosh, and Microsoft was the first major company to develop programs for the Mac. In the end Microsoft BASIC and Microsoft Multiplan were shipped simultaneously with the introduction of the Macintosh, and Microsoft announced at the launch that Word, Chart, and File would ship soon.
When I look back at the history, I see no sign that Bill Gates was betting against Steve Jobs. His most successful bet was not on Steve Jobs. But he had lots of bets on Jobs as well.
For more on the history, see http://www.thocp.net/companies/microsoft/microsoft_company.h...