Earlier quoted context omitted.
Microsoft didn't buy Xbox, they built the entire ecosystem themselves...
Ok, but they bought DOS. They bought MSSQL (Sybase). They stole half of OS/2 and then pivoted to Windows NT with ex DEC folks. Its biggest products were all (mostly) bought. Oh yeah, Halo.
Every big company has a raft of acquisitions in their history and if you really want to you can draw a tenuous line between an acquisition and a subsequent product line. The claim that Microsoft "fundamentally doesn't make anything, they never have" is just silly.