stella ost to pst converter tool is the best tool to convert all ost mailbox items in to pst file this tool is convert all corrupted and unmounted ost mailbox items in to pst file this tool is convert all ost mailbox items like emails, contacts, calendars, task, notes and many other items in to pst file this software is convert all version 32bit and 64bit ost file. for more info visit this link https://www.stelladatarecovery.com/email-migration/ost-to-office-365.php
Export mailbox as a PST file
Login to Outlook with the Exchange account that was used to create the OST files. And to export the OST mailboxes to PST, follow the simple procedure as given here:
Go to Files >Open & Export and click Import & Export.Import & Export
Select Export to a file; then click Next.Select Export to a file
Select the second option—Outlook Data File (.pst)—and click Next.Select PST file
Select the folder(s) which you want to export and click Next.Select the folder to export
Note: You have the option to include subfolders as well.
Browse the location where you want to save the new PST files and choose an option regarding the duplicate items.
Note: There is an optional choice to provide a password to the PST file, but you can easily move ahead without choosing it.
You can convert OST to PST with CloudMigration OST to PST Converter Tool. This tool converts OST to PST, EML, EMLX, etc. You can easily migrate OST to Gmail, Yahoo, AOL, Office 365, etc. You can try its free demo version.