Here is what Microsoft needs to do:
1) Bring back old start menu (as an option).
2) Go straight to desktop (as an option).
The problem is that users expect no learning curve.
The Home version with the touch Metro-esque interface and social network integration makes a lot of sense.
This simultaneously seems completely inappropriate in a professional environment. It shouldn't even be a part of Professional, or if it is, then as an add-on after the fact.
Microsoft is famous for making one-size-fits-all solutions to problems that aren't so simple, and this is one of those cases.