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"That would've been an interesting use case for bridging the experience between tablet and traditional PC."
That was my thought on what Microsoft is trying to do.
I think that is what Canonical is also trying to do with Ubuntu on Android.
It might turn out to be a stupid choice or a smart choice bij Microsoft. Atleast they tried to do something, they probably felt they needed to come up with something as the smartphone and tablet market are very large.
I still think it makes some sense IF someone can get it right. Maybe the Ubuntu solution is the way to go: add a second interface, don't try to combine to much.
A bluetooth keyboard and mouse, wifi for networking and only connecting a big screen to a device you already have doesn't sounds all that alien to me.
There are a lot of companies dealing with issues about how to go deal with "bring your own device".
I wouldn't be surprised if you'll see a lot of terminal server/remote desktop/desktop virtualisation/whatever as well.
Only time will tell.
Metro might be the wrong idea, which is interresting.
Windows Vista was a mis, Windows 7 seems to be a hit, Windows 8 might be a miss, this looks like a pattern.
However things pan out, it is always an interresting development with so many things going on to see one of the biggest players possible getting it wrong.