Windows Migrate Emails from OST file to Office 365

I have some old OST files from different Exchange Server accounts and Outlook account. Now I am using a new account with office 365 subscription. Is there any option in Outlook that can migrate emails from OST file to Office 365 server or any other method?
 
Didn't you saved all mails in pst?
You can configure your O365 in your existing outlook and then move all mails from your existing ost/exchange to new O365 cloud.
 
Only way to do this is first convert it into PST file and then upload it to office 365.
Another way which you can opt for use third-party software.
 
You need to convert OST to PST using a converter, and then upload the PST file to Office 365. YouTube has pretty simple tutorials to solve this complex challenge.
 
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