WordPress version 3.0.*
http://codex.wordpress.org/Version_3.0
Content Management System
Get access to data on 209,915 websites WordPress 3.0 Customers. We know of 7,253 live websites using WordPress 3.0 and an additional 202,662 sites that used WordPress 3.0 historically and 3,132 websites in the United States.
Get a list of 209,915 websites using WordPress 3.0 which includes location information, hosting data, contact details, 7,253 currently live websites and an additional 1,551 domains that redirect to sites in this list. 202,662 sites that used this technology previouslyand 3,132 websites in the United States currently using WordPress 3.0.
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