Originally friends, then enemies, then respectful rivals, Jobs and Microsoft co-founders Bill Gates and Paul Allen have a long history that will undoubtedly be recounted for years to come.

In a memoir out next month, Microsoft Corp. co-founder Paul Allen details tensions in his relationship with Bill Gates, including a scene from 1982, when he overheard Gates talking to ...

It was co-written by Bill Gates, the late Paul Allen, and Monte Davidoff, who gave us an interview that same year. These days, you can study the annotated source code on GitHub.

Here's a look at some of the ways you might be contributing to Microsoft's sprawling empire without even knowing it.

Satya Nadella emphasized that Microsoft needs to reinvent itself in the age of AI, moving beyond its traditional "software ...