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The offline Outlook Data File (.ost) is also saved at drive:\Users\user\AppData\Local\Microsoft\Outlook. Most
data remains on the server; however, any items that are saved locally should be backed up. For example, Calendar, Contacts, Tasks, and any folders marked Local only.

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Outlook Data Files (.pst) created by using Outlook 2013 or Outlook 2016 are typically saved on your computer in the Documents\Outlook Files folder. If you upgraded to Outlook on a computer that already had data files that were created in Microsoft Office Outlook 2007 or earlier, these files are saved in a different location in a hidden folder at drive:\Users\user\AppData\Local\Microsoft\Outlook.