That cant be said. DDNet and KoG servers are also available for 0.7 clients, and my server for example (0.7) is also available for DDNet clients. So its mixed already. But as soon as DDNet moves to 0.7 (if that ever happens), 0.6 will probably die
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Also noby's fng server and the unique race servers are available for 0.7
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so the most played servers are shared between both versions, except for BW, which is 0.6 only. Might change in the future too, nobody knows