<https://forums.slipstick.com/threads/96110-convert-pop3-account-pst-to-imap-ost/>
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"I have a friend with a long-time account on Outlook Desktop (2013 or 2016 - not sure), his computer is now running Windows 10 - with Australian ISP Telstra (bigpond.com). His email connection is using POP3, and he organized his email into  a..."
<https://forums.slipstick.com/threads/96110-convert-pop3-account-pst-to-imap-ost/>