Windows Migrate Emails from OST file to Office 365

[ralphmiller]

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?

 

[nRiTeCh]

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.

 

[ralphmiller]

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.

No, I don't have a pst file .

 

[vivek.krishnan]

Is this for a company or for personal, and if personal, how did you get hold of OST files?

 

[Alan Samuel]

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.

 

[Vinborris]

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.