How to archive IMAP emails
Download:
Outlook 2013 and Outlook 2016:
Please read:
https://support.office.com/en-us/article/Back-up-your-email-e5845b0b-1aeb-424f-924c-aa1c33b18833
Mac:
Please read:
https://customers.machighway.com/knowledgebase.php?action=displayarticle&id=233
Thundebird:
Please read:
https://support.mozilla.org/en-US/kb/archived-messages