>Windows is one of the great engineering feats of CS
Do I have to point out all the lame exploits and bugs which take so long to get fixed, the terrible design, the "things which should have been there years ago but we still don't have" like a decent file manager, task manager, copy utility? And AFAIK Windows made few major contribution to the theory of OSs (semaphores, threads, paging, scheduling and so on) so there's really nothing to be amazed at.
I'll spare you my opinions on Bing. Reinventing the wheel is not worth describing, no matter how beautiful that wheel is, although I'm happy for you to be a part of the team making that wheel. If only Bing had more ambition than just being a clone of Google Search, some people under 70 would actually consider migrating. But if you're happy with your default-search-engine-bundled-with-IE market share at 20%, good for you (eh, it does bring a lot of ad money). You may not call the shots at MS, but you can at least admit all the shortcomings.