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You can use these instructions to import a PST file into your mailbox:
In general, what you'll need to do is first use Outlook's import/export function to export your mail items to a PST. After that, you'll create a new Outlook profile that connects to your Office 365 mailbox, which it should be able to do automatically using Autodiscover. Finally, you'll need to import the PST into your Office 365 mailbox with the link above.