Microsoft will not lose corporate customers because of Win8, as there is no realistic alternative to Windows.
But what about Linux? Or MacOS? Or ChromeBook?
Well I run a business, what is my opinion?
The software I need only runs on Windows. My POS system, inventory management system are Windows only. If I wanted Linux POS software I would need to go open source. Not really an option as the solutions are garbage pre alpha software that is unusable in the real world.
Maybe Win8 will not appeal to businesses like Vista did not. No matter they will buy Win7. Anyone who has used Win7 will see that it is a fine OS. I was surprised at how good it was to be honest. Strange that a MS OS is so good.
As for the market competition and such. MS already has won the console wars against Sony and Nintendo. I love my Wii but the 360 is a better unit, disregarding early RROD problems (I have the slim). Hardcore console gamers will buy the next XBOX as well, Kinect is better than the Wii & PS move anyways. So if MS can win the console wars it is not impossible to imagine they will have success in the phone industry. Perhaps the premium phones will be Apple and Android but the entry level phones will probably start to be Win phones, and to be honest my parents and grandmother would be better served with a Win7 phone than Android or iPhone due to it's ease of use.
This is my take on the matter. Geeks/power users will get Android phones, hipsters, 20-30 year old women and iSheeple will get iPhones, 12 year olds and tech un-savy 50+ year olds will get Win8 phones. In fact MS/Nokia should just go ahead and start bundling the phone with free software like they do with the XBOX, buy this phone and get Free Angry Birds Premium & Draw Something. People really are dumb enough to buy something based on that.