Hi, if you want to Migrate OST to Office 365 then You Can takes the help of OST to Office 365 Migration software. By using this software the user can easily perform the OST to Office 365 Conversion effortlessly. For complete information, the user can try the demo version of this software.
Login to your Office 365 account >> Admin Center >> Exchange.
The Exchange Admin Center window will appear>> Permission>> double click on Organization. Management a new popup appears >> + sign >> select Mailbox Import Export >> Add >>Ok. After that, select Mailbox import export again >> Save.
