At the top of your Outlook ribbon, choose File.
Choose Open & Export > Import/Export.
Choose Export to a file.
Click Outlook Data File (.pst)> Next.
Select the name of the email account to export, as shown in the picture below. Only information for one account can be exported at a time.
Make sure that the Include subfolders check box is selected. This ensures that everything in the account will be exported: Calendar, Contacts, and Inbox. Choose Next.
Click Browse to select where to save the Outlook Data File (.pst). Enter a file name, and choose OK to continue.
Note: If you’ve used export before, the previous folder location and file name appear. Type a different file name before choosing OK.
If you are exporting to an existing Outlook Data File (.pst), under Options, specify what to do when exporting items that already exist in the file.
Outlook begins the export immediately unless a new Outlook Data File (.pst) is created or a password-protected file is used.
If you’re creating an Outlook Data File (.pst), an optional password can help protect the file. When the Create Outlook Data File dialog box appears, enter the password in the Password and Verify Password boxes, and choose OK. In the Outlook Data File Password dialog box, enter the password, and choose OK.
If you’re exporting to an existing Outlook Data File (.pst) that is password protected, in the Outlook Data File Password dialog box, enter the password, then choose OK.
Now that your Outlook data is in a .pst file, it's portable. You can save the .pst file to OneDrive, then download it to your new computer. You can also save to a portable drive, then import your email, contacts, and calendar to Outlook.