If you are still searching for a more convenient solution to convert OST file into PST format, download MailsDaddy OST to Office 365 Migration Tool. Using this helpful solution uses can migrate multiple OST files into Office 365acount and Outlook PST format without any changes in original content. It allows users to easily filter and convert some selected OST file databases into Office  365. 

Some other features:-

1:- Easy to install and use for all users.

2:- Easily recovers overall OST file databases.

3:- Allows to shift multiple OST files into Office 365 different accounts at a single time.

4:- Helpful to migrate offline OST files into Cloud 365 primary & archive mailbox.

5:- Support all editions of Microsoft Outlook and Windows OS.

To know more, visit here:- Migrate OST to Office 365