I wonder if some brand manager at Microsoft is lying awake at night, fuming:
It's Windows Phone 7 Series. The "Series" evokes future promise, the outline of an evolutionary path to reassure the possessor that their investment in Microsoft technology will accrue benefits for years to come. Calling it "Windows Phone 7" cheapens it into just another product, flaring oh-so-briefly briefly before it is trodden into the mud by Windows Phone 8. Curse you, Mary-Jo! Curse you!