How long does it take to migrate IMAP mailboxes to EML format? Homepage › Forums › General › How long does it take to migrate IMAP mailboxes to EML format? This topic has 0 replies, 1 voice, and was last updated 6 months, 1 week ago by arjunmehta. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In