Original sentence: It has a significant user base with 17,127 registered sites with 6,723,094 users in 647,726 courses (as of October 18, 2006).Moodle has a significant user base with 17,127 registered sites in 158 countries with 6,723,094 users in 647,726 courses (as of October 18, 2006)
Edited sentence: It has a very large user base with 13,909 registered sites in 158 countries with 4,972,676 users in 455,685 courses (as of August 2, 2006).Moodle has a very large user base with 13,909 registered sites in 158 countries with 4,972,676 users in 455,685 courses (as of August 2, 2006)