That's it. That is the reason most of their products are half-assed. They have database systems. Server, desktop, and tablet/phone operating systems. Web, desktop, mobile development environments, all in multiple languages. They have their IaaS and PaaS offerings. They have end user services like Skydrive and Outlook. Then there is everything Office. And games, both PC and Xbox. Also, Bing. And Skype. Edit: And hardware: Xbox, peripherals and the surface.
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This is probably an incredibly incomplete list. Try making this list for Apple, and you'll get my point.