Open Outlook. Go to the file menu and choose import and export. Choose Export to a file.

Choose Personal Folder File (.pst) and click Next.

Highlight Mailbox – yourname or Personal Folders and check the box for Include Subfolders.

Click Browse and choose to save the backup.pst file to your Desktop, click Finish

Click Ok, a progress window should appear. Once it has gone away close Outlook.

Confirm that the backup.pst file has been created on your Desktop