Effective solution to migrate emails from one IMAP Server to another IMAP Server
Email Migration Tool to migrate IMAP Server mailbox . This is effective solution to migrate emails from one IMAP Server to another IMAP Server. This includes Gmail, Yahoo, Office 365, Google Apps, AOL, Hotmail, and several other accounts. The utility is so lightweight that it uploads to your system in less than 5 minutes and allows users to export the data at a fast speed.This tool is Independent solution to migrate IMAP server emails to another IMAP.No need to transfer complete database of IMAP server as the tool comes with an advanced filter by which users can move only desired folders like Inbox, outbox, drafts, etc. from one IMAP Server to another.
Follow this link :- https://www.wholeclear.com/mail-migration/

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Daniel commented
If you are searching for a IMAP Migration Utility then this Cloud Migration Software offers to migration of cloud emails of one account to another account. You can export emails of these clouds to another cloud. This includes Gmail, Yahoo, Office 365, Google Apps, AOL, Hotmail, and several other accounts. The free trial version of this application is also available. You can visit here for more information:-https://www.sametools.com/cloud/migration/