It's only the legacy of the corporate purchases of the Windows OS and Office that keep the Microsoft going.
Everything else, but especially this. And the Windows OS has always been given away with little or no visible cost to the consumer, as a delivery system for MS Office. Which means that the MS Office division has ALL the clout, calls ALL the shots, and when something else interesting starts happening elsewhere in the company the MS Office division starts raiding to get control influence over that project, snag all the smart people, and end up scuttling the technology as a threat to their hegemony.
Probably the only reason Xbox did so well was that its market was in no way a threat to MS Office's power. As a game console, it was entirely unrelated and stepped on no toes, so it was able to actually organically develop.