To Export Mailboxes from Outlook to a New Outlook? After that, I'd advise you to give ZOOK OST to PST Converter a try.Converting the user's whole OST data set to PST format is the best solution. It is simple to export OST emails, contacts, notes, calendar events, tasks, to-do lists, and much more into PST format. With this software, users may easily convert IMAP OST files that are corrupted, orphaned, or both into PST format. OST files can be successfully converted to PST format by non-technical users thanks to the utility's user-friendly interface. Additionally, OST to PST Converter provides a free demo edition of the application so that users can see its helpful features. 25 items can be convert OST file to PST format by users during  the utility's free trial period. 

Check for more details at: Export OST Files into PST Format

Exporting Outlook mailbox to new Outlook can be done safely by exporting the OST file of the previous Outlook to PST format and then importing that PST in your new Outlook. Try Softaken OST to PST Converter to convert the OST files into PST format accurately. This software can be used for recovering the damaged OST files and saving them as PST files for reuse.