Remember that, if you have an Enhanced account, you can use ActiveSync, to not only sync e-mails, but also contacts and events.
Also note that you can log on to Afterlogic WebMail from your iOS device and it shall offer an automated way (profile) of setting up e-mail as IMAP, along with calendars and contacts (CalDAV/CardDAV).
Here's the step by step for setting up an IMAP account on iOS.
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