Overview
Step by step instructions on how to backup your mailbox in Outlook to a .pst file
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At the top of your Outlook ribbon, choose File.
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Choose Open & Export > Import/Export.
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Choose Export to a file.
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Click Outlook Data File (.pst)> Next.
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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.
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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.
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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.
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Choose Finish.
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Outlook begins the export immediately unless a new Outlook Data File (.pst) is created or a password-protected file is used.