Bill Gates at Microsoft some Macintosh prototypes to use to develop software, and in 1985 Microsoft subsequently came out with the Windows operating system, a version of GUI for use on IBM PCs.
Steve Jobs's famous volatility led to his resignation from Apple in 1985. Jobs then founded NeXT Computer;the NeXT Cube computer proved too costly for the business to become commercially profitable, but its technological contributions could not be ignored. ln 1991, then-Apple CEO Gilbert Amelio bought out NeXT hoping to use its Rhapsody, a version of the NeXT Step operating system, to jump-start the Mac OS development, and Jobs was brought back as a part-time adviser.