Import or copy email from Gmail or another email provider to Office 365.
You need to use a version of Outlook that is installed on your desktop for this task. Outlook is included in most Office 365 plans.
Import from Outlook (desktop)
Follow these steps to export email, contacts and calendars from Outlook to a .pst file, and then import that file to Outlook with Office 365
Export or backup email, contacts, and calendar to an Outlook .pst file
These instructions assume you've already exported your Outlook email, contacts, and calendar from another instance of Outlook, and now you want to import them to Outlook.
1. At the top of your Outlook ribbon, select File.
If your ribbon doesn't have a File option in the top left corner, you aren't using an Outlook app installed on your computer. See What version of Outlook do I have? to find your version of Outlook and to get to right import steps.
2. Select Open & Export > Import/Export. This starts the Import/Export wizard.
3. Select Import from another program or file, and then click Next.
4. Select Outlook Data File (.pst) and click Next.
5. Browse to the .pst file you want to import. Under Options, choose how you want to deal with emails and contacts, then choose Next.
6. If a password was assigned to the Outlook Data File (.pst), enter the password, and then click OK.
7. If you're importing the contents of your .pst file into your Office 365 mailbox, choose that mailbox here.
If you're NOT importing into your Office 365 mailbox, choose Import items into the current folder. This imports the data into the folder currently selected.
8. Choose Finish. Outlook starts importing the contents of your .pst file immediately. When the progress box disappears, the import is finished.