To export offline OST emails to PST format for Outlook, use the most dependable software available: ZOOK OST to PST Converter. This tool lets users access orphaned, IMAP, cached, and crashed OST files into PST format, which makes it possible to open OST files in Outlook. It can also migrate OST to PST format, allowing users to move calendars, emails, attachments, contacts, notes, tasks, to-do lists, and other data into PST format. The program effortlessly supports any version of Microsoft Outlook, including the most recent ones. Users may also test and verify the utility's functionality, which promises to convert 25 items from each folder of OST files into PST format without losing any data, using Outlook 2016, 2013, 2010, 2007, 2003, and so on.

Check for more details at: Convert OST files into PST Format