combining a users's messages?

[Mike]

I am in process of moving my users from a POP3/local mail
store to IMAP4/cyrus. One user has many messages all in
little tiny folders. I can copy the messages from one folder
to another folder on the server. Is there a command to
tell/have cyrus to rebuild the binary index files?

/var/spool/imap/users/X/X/cyrus.cache
/var/spool/imap/users/X/X/cyrus.header
/var/spool/imap/users/X/X/cyrus.index
/var/spool/imap/users/X/X/cyrus.seen

and

/var/lib/imap/user/X/X.seen
/var/lib/imap/user/X/X.sub

# rpm -qa | grep cyrus
cyrus-sasl-md5-2.1.20-6
cyrus-imapd-2.2.12-6.fc4
cyrus-sasl-plain-2.1.20-6
cyrus-imapd-devel-2.2.12-6.fc4
cyrus-sasl-devel-2.1.20-6
cyrus-sasl-2.1.20-6
cyrus-imapd-utils-2.2.12-6.fc4

Mike