It should be clear by now that a Cyrus installation provides a powerful and flexible mail system. Installing and configuring it correctly is not a simple process, but, once set up, it provides a vastly superior alternative to the traditional POP3 mailbox setup.
Most mail clients can be configured to use multiple IMAP accounts, so for users with many mailboxes, IMAP simplifies mail handling immensely - all your mail accounts can be handled from anywhere with an IMAP client. The use of IMAP webmail clients can vastly simplify life for roaming users, who can then access their mail from anywhere with an internet connection.
The following are good sources of IMAP related information:-