Summary: Learn what you should do when ScanOST fails to work and; you want to get rid of an annoying OST file error message that

Microsoft Outlook uses .OST and .PST file to store the information of emails and other mailbox related items. Where OST is an offline folder file

When you use Microsoft Outlook, your email and all mailbox items are saved in .ost and .pst data files. The Offline data file (OST) file
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