How to create an OST file in office 365?
The SysInspire OST to PST converter software ensures that the user can even import the OST file in office 365.
With this software, the user can obtain all inbuilt features for creating OST files in Office 365 directly. There is even no data missing.
The folder structure is also not reframed rather preserved during creation of the file in Office 365.
All types of OST mailbox folders like sent items, the contacts, the calendar, notes, and all other stuff are successfully transported to office 365.
The pinpoint theory is that there is no limitation for OST to Office 365 migration.
More info:- Search on Google SysInspire OST to PST converter software

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Joy Hopson commented
eSoftTools OST to Office 365 Converter is an email conversion program that can scan and transfer all the data from an OST file to Office 365 in just a few clicks with no data loss. The user interface of this app is quite simple and easy to use for non-technical users. This OST Recovery program recovers any corrupt or missing OST files and works with all Microsoft Outlook versions, including 2019, 2016, 2013, 2010, and others.
Read more:- https://www.esofttools.com/ost-to-office365-converter.html