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It is windows as well as linux, but it is not integrated into the mainline yet. It is still a work in progress.

What I did was competely remove the "default address" functionality, as it doesn't really do anything beyond confuse users. It now simply shows you a list of addresses on which you can receive coins.
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Sounds like a nice improvement to the addresses UI
Did you decide to do that on your own? Or as a response to user requests?