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The Default path for All Microsoft Office Outlook .pst file location is the User data(Your account name)/Local Settings/Application Data/Microsoft/Outlook/ this is where the .pst files are stored by default!!! this goes for All Windows OS! Tuesday, June 05, 2012 12:18 PM.
PST file (Personal Storage Table or Personal Folders File) is a file where Microsoft Outlook stores all of your Outlook items: Email, Calendar events, Contacts, Tasks and other. After you setup your account in Microsoft Outlook it will automatically create a PST file and associate it with your created account.