No Market Share movement for vBulletin 4.x yet sorry.
Get a list of 32,059 websites using vBulletin 4.x which includes location information, hosting data, contact details, 20,910 currently live websites
which includes 10,286 domains that redirect to sites in the list. 21,435 sites that used this technology previously and 5,994 websites in the United States currently using vBulletin 4.x.
Distribution of locations of all vBulletin 4.x customers we've ever tracked.