[Dovecot] renameing users

Hi All,

I have a pretty basic question - I'm just getting into this email business =).

There is a server that uses virtual users with dovecot. How could I go by allowing the users to change their usernames and to let them save all of their info? Access to the mailboxes is provided via squirrelmail . Thanks in advance! p.s. please cc me in the reply!

Best Regards,

Ivan Levchenko levchenko.i@gmail.com