1. Open Outlook desktop application.
2. Choose Open & Export > Import/Export.
3. Choose Export to a file.
4. Click Outlook Data File (.pst) and choose Next.
5. Select your name and Include subfolders. This ensures that everything in the account will be exported: Calendar, Contacts, and Inbox. Choose Next.
6. Click Browse to select where to save the Outlook Data File (.pst). Enter a file name, and choose OK to continue.
7. Choose Finish.