WordPress version 2.5.*
http://codex.wordpress.org/Version_2.5
Content Management System
Get access to data on 25,936 websites that are WordPress 2.5 Customers. We know of 2,889 live websites using WordPress 2.5 and an additional 23,047 sites that used WordPress 2.5 historically and 305 websites in the United States.
WordPress 2.5 websites that are also using other technologies.
Get a list of 25,936 websites using WordPress 2.5 which includes location information, hosting data, contact details, 2,889 currently live websites and an additional 483 domains that redirect to sites in this list. 23,047 sites that used this technology previously and 305 websites in the United States currently using WordPress 2.5.
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