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All I know is that the thread for the namespace migration project started in mid 2011 but people have been moving pages before the thread was created so not exactly sure when but don't think it's any further than 2009/2010.
I remember that the first major migration was Twilight. That should help us figure it out.
TVT Timeline question regarding namespaces
Does anyone know/remember when we started no longer using the Main namespace for media pages?