[Dovecot] renameing users

[Ivan Levchenko]

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 at gmail.com