Openfire does not import all my AD users

Hi folks.

I’ve been using openfire for a while, and it’s great!

I connect with my AD (Windows Server 2008 R2), and works perfectly. Only after a while I noticed that some users do not exist in openfire, but exist in AD. These users were created before the openfire be deployed. How can I force the openfire to re-import all the AD user accounts?

Sorry for my english…

Thanks a lot.