Windows – initially a poor shell over DOS
And DOS itself was bought in, it was originally 86-DOS.
It’s a really good question actually, how many true innovations have come directly from the big names rather than being acquired from swallowed-up smaller companies and startups?
I suppose the iPhone really cemented the lozenge form factor of a touch-screen smartphone, and the iPad was probably more innovative in that it actually created a non-existent market with something that hadn’t really been done before (outside of the PADDs in Star Trek: TNG anyway). But typically the big companies seem to be more about evolution rather than revolution.