Transfer Emails from One Cloud to Another
Download Cloud Migration Tool and export emails from one webmail to another webmail account. Sometimes, users want to migrate emails from one cloud to another cloud due to some requirements. This software is really helpful in performing the migration.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. The size of mailboxes does not matter, one can easily migrate webmail emails of one account. you can easily migrate complete cloud emails from one to another.
Follow this link :- https://www.betavare.com/cloud-migration-tool/

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Daniel commented
If you want to transfer emails from one cloud to another cloud then you can try this Cloud Migration Tool. The software is an excellent application that enables users to backup and convert one cloud to another cloud. You can install its free demo version and convert few emails per folder free. The utlity is very easy to use and provides data security. Many users have got benefit from it. You can download this app from here:-https://www.sametools.com/cloud/migration/