Comment by fsckboy

>"when Gates saw the Xerox machine, the display had no overlapping windows". So M/S cloned it as he saw it. Once M/S W1.0 was developed he saw the demo again and was surprised the windows overlapped.

Microsoft had Apple Lisa's in-house, and Charles Simonyi in person direct from Xerox PARC, and worked on pre-release Macintoshes in coordination with Apple to develop Microsoft Word for the Mac, all well in advance of any MSWindows development. There is no way the story is as simple as the above.