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Pretty cool. However, after using the Lumia 900's 4.3in screen with WP7 it would be hard to use on an iPhone's tiny screen. Cool idea, but if you wanted WP7 software it would be much better to straight up buy a handset for it. Unless you were on Verizon[Who doesn't have any good WP choices].
 
Had the Windows 7.5 theme on my iPhone using dreamboard. Really, really cool but Dreamboard slowed my phone down SO much it was unbearable. It would, literally, take around 10 seconds to open the cameral app, settings and many other things.

Finally had to delete but it was pretty damn neat while I had it.
 
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