Convert IMAP OST files to PST in Outlook 2016: For active accounts, use File > Open & Export > Import/Export. For orphaned data, use third-party OST converter. Preserve folder structure during migration with this step-by-step guide.https://myarticles.io/how-to-move-imap-ost-files-to-outlook-2016-pst/

How to move IMAP OST files to Outlook 2016 PST? - MyArticles

IMAP OST files are offline copies of your email mailbox that are stored on your device. However, there can be various factors where you need to move IMAP