Migrating Fedora UW-IMAP to Courier IMAP 

1. Perform a fullbackup (a must)
2. Stop sendmail and IMAP/POP3 service
3. Uninstall UW-IMAP
4. Download and install Courier IMAP Server from

Courier -

http://rpm.pbone.net/index.php3/stat/4/idpl/1875700/com/courier-0.42.2-1.7.2.i386.rpm.html

Courier IMAP -

http://rpm.pbone.net/index.php3/stat/4/idpl/1389464/com/courier-imapd-0.42.2-1.7.2.i386.rpm.html

Courier POP3 -

http://rpm.pbone.net/index.php3/stat/4/idpl/1875740/com/courier-pop3d-0.42.2-1.7.2.i386.rpm.html

(More …)