The much-anticipated Zune, Microsoft's portable music player entry, 
has received mixed reviews, and demand has been tepid. Sure, 
Vista made its debut, finally, last week--but only for business customers. 
The Windows XP successor, more than five years in the making, didn't make it into 
consumers' hands for the all-important holiday sales season. Ditto for Office 2007, 
the flagship of the company's second most-profitable product line.