Historically, I think there was an overlap of APIs between early Macintosh and early versions of Windows because Microsoft was porting their software. Microsof

Historically, I think there was an overlap of APIs between early Macintosh and early versions of Windows because Microsoft was porting their software. Microsoft released the first version of Excel for the Macintosh on September 30, 1985, and the first Windows version was 2.05 (to synchronize with the Macintosh version 2.2) on November 19, 1987. https://en.wikipedia.org/wiki/Microsoft_Excel#Early_history https://en.wikipedia.org/wiki/Microsoft_Excel#Early_history