Fedora Upgrading

If you've upgraded from Fedora Core 1, it replaced obsoleted UW-IMAPd with Cyrus-IMAPd. To install Dovecot, first uninstall Cyrus-IMAPd:

yum remove cyrus-imapd*

Then install Dovecot:

yum install dovecot

Of course you can use too up2date or apt to do so.

If you migrate from UW-IMAPd and have mail stored inside the users' home directories as well, you then will have to do some steps foreach mail user:

cd $HOME
# move all subscribed mailboxes to mail/
mv $(cat .mailboxlist) ./mail/
# move subscriptions file
mv .mailboxlist ./mail/.subscriptions

For more explainations and details please see Migration.