If you want to save your IMAP emails into Outlook PST format, try MailsDaddy IMAP backup software. This utility can easily and quickly export IMAP emails into PST, MBOX, RTF, EML, EMLX, HTML, MHTML, etc. Users can smoothly take backup IMAP emails from any IMAP Mail Server without any technical issues or data loss.
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https://www.mailsdaddy.com/imap-backup-tool/