Windows Phone 7.5 has a unique animated tile design that reviews swoon over. The Lumia 900 goes on display at the International Consumer Electronics Show in Las Vegas Monday and will be sold through AT&T stores.  It joins the simpler Lumia 710, already available through T-Mobile.  But what's causing all the buzz is not the hardware behind the Lumia. It's the software. That's because the Lumia 900 runs Windows Phone, long derided by the technohip as a drab also-ran, somewhere on the evolutionary scale between a rotary dial phone and an early Blackberry...

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