kindle

depends which kindle - they are available on Kindle Fire. I doubt they'd want to put it on a standard black and white kindle, as it's not a magazine format (black and white, pretty much text only, no colour pictures)
 
I can't see anyone wanting to use a free Kindle reader app on a Windows phone to view a mag. like PBO or YM. Kindle's are great for text but even grayscale pictures aren't great (clunky zoom). So not much of a market for colour magazines on a BW optimised format displayed on a colour screen.

A free reader for a magazine format in colour is a completely different beast. These are much more likely to become available. However, I haven't checked the current situation wrt Windows phones.
 
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