To export Outlook OST files to Office 365, I recommend MailsDaddy OST to Office 365 Migration Tool. OST is very helpful in maintaining the entire structure of the folder and the folder and its sub-folders and without any hindrance. The software preserves complete HTML formatting and metadata. You can solve all OST Office 365 errors or problems with this reliable application. Users can use this toolin all Windows operating systems without the need of MS Outlook.
Get more details: https://www.mailsdaddy.com/ost-to-of...igration-tool/

 

I pledge additional OST to PST Software, this application is quickly switching data with migrating into Outlook from injured OST file.

Download link: https://www.sametools.com/convert/ost/