What changes will I need to make to use IMAP?

To enable IMAP access, you will need to disable your POP3 account and recreate it using the new IMAP settings. To enable, select the IMAP protocol when going through the email client account creation wizard. For more information on supported clients, click here for more information about IMAP.
IMAP (incoming) server settings: imap.comporium.net, port 993, SSL enabled