If you sync IMAP mail account settings from your computer to iPhone or iPod touch, and the IMAP folders on your computer are all shown under your Inbox folder, then it might not work as expected on the device.

Go here to see the original:
iPhone and iPod touch: If IMAP Mail folders are not visible

Similar Posts:

• iPhone and iPod touch: Mail may unexpectedly quit if webmail account settings are synced
• iPhone and iPod touch: Gmail account will not connect to Gmail server
• iPhone and iPod touch: Search with Mail accounts and servers
• iPhone and iPod touch: How to configure Exchange Mail settings to increase or reduce the amount of emails displayed on the device
• Overview of syncing iPhone or iPod touch with your computer