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mike_intellivision said:

 

But from what I have heard,  it renders existing software  obsolete.

With mobile devices, this might not be that much of an issue. But for business, if you are telling them that all new computers new Windows and Office -- and that it won't work with existing platforms --  it could lead to big changes in business computer use.

 

Mike from Morgantown

Who has a WM6.1 phone.

 

Yes, all applications developed for WM will not be compatible with WP7.  They would need to be ported over.