May be when they first made their Basic interpreter. And Word for Windows.
But everything else was an acquisition or a clone. DOS bought, Windows cloned from Xerox and Mac, Excel cloned from Lotus-123, FoxPro bought, XBOX cloned from playstation, Internet Explorer bought.
BTW, Word cloned from Word Perfect. BASIC interpreter cloned from all the previous BASIC interpreters that existed.
Being first or "leading" don't matter. It's about execution and a bit of luck. Look at Android. It sure as heck wasn't first, but they executed. Windows wasn't first, but they executed.
I mean, everything ever done with digital computers is an extension of Charles Babbage's work on the difference engine, which was cloned from Pascal's calculator of the 1640s, maybe with a couple of enhancements here and there. See how you sound?