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    If your data files in Outlook won't open or get corrupted, or items appear to be missing in your inbox, you can use these steps to resolve the issues.
    The desktop Outlook app uses two types of data files to store local copies of your emails, calendars, contacts, and other items, to allow you access to your information without an internet connection.
    If you're using an Outlook.com, Outlook 365, or Exchange account, this information is stored in an Offline Outlook Data File using a .ost format. However, if you're using a POP or IMAP account like those you get from an Internet Service Provider (ISP), your information will be stored in an Outlook Data File using a .pst format instead.
    Typically, you can go for a long time without any problems, but sooner or later, these files may stop working, and they can get damaged, which is why Outlook includes the Inbox Repair tool to diagnose and repair common errors with .pst files, as well as a mechanism to recreate .ost files automatically.

    Full story from the WindowsCentral blog...
    02-07-2018 06:10 AM

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