How many users can WordPress handle?

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I want to design a member login site in WP but I have a doubt that is WordPress can handle more than 40000 users on same database?

I am not sure about this so I am stooping my work here. So please help me if anyone know exactly about this to proceed my project with WP.

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According WP database structure, ID in wp_users is Bigint(20) UNSIGNED, so you could “theoretically” add 18446744073709551615 users.
http://dev.mysql.com/doc/refman/4.1/en/integer-types.html

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