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And now, at the official N900 meet-up in London, Nokia has pretty much admitted it. Nokia's NSeries devices - i.e. most of their high-end smartphones - will all be powered by Linux-based Maemo by 2012.
While this doesn't mean that Symbian is going away completely, it's a major focus shift from a platform that Nokia has been pushing for so long. Nokia has probably recognized that Symbian will not be able to compete with Android and the iPhone in the foreseeable future, so they've decided to build their own Android (Maemo, just like Android, is Linux-based) and push their flagship devices on it, while Symbian will probably keep powering the video and photo focused X and E-series devices.