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Use the following steps:-
1. At the top of your Outlook ribbon, choose File.
2.Choose Open & Export > Import/Export.
3. Choose Export to a file.
4.Click Outlook Data File (.pst)> Next.
5.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.
6.Click Browse to select where to save the Outlook Data File (.pst). Enter a file name, and choose OK to continue.
7.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.
8. Choose Finish.
9. Outlook begins the export immediately unless a new Outlook Data File (.pst) is created or a password-protected file is used.
Hope this solves your problem.