I'm ambivalent about this. It reminds me of the way Palm reacted to the Pocket PC. Palm had a platform that was superior to WinCE for low-power devices, but it wasn't a potential "notebook replacement" the way the Pocket PC was. Instead of playing their strengths, they spent them by trying to scale their event-driven OS up to do things it was poorly designed to, while promising a new OS real soon... and failing on that promise.
When someone makes a disruptive move against you, the worst thing you can do is to ignore them, but the second worst thing you can do is let them pick the playing field when you DO respond to them. That's what Palm did in response to Microsoft, and that's what Nokia's doing now.
So while I think this is probably going to be a good thing, if the license they're using is cleanly open, but I'm concerned about the context they're doing it in.
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