There are just under 5000 Community Builder users. I am not even getting to the "export" screen, though, it is just telling me that the page cannot be found.
Server information below. Thank you.
PHP Built On Linux host.syndikast.net 2.6.18-308.8.1.el5 #1 SMP Tue May 29 14:57:25 EDT 2012 x86_64
Database Version 5.0.96-community
Database Collation utf8_general_ci
PHP Version 5.2.17
Web Server Apache
WebServer to PHP Interface cgi
Joomla! Version Joomla! 2.5.8 Stable [ Ember ] 8-November-2012 14:00 GMT
Joomla! Platform Version Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0