{"id":8594,"date":"2023-11-03T07:10:30","date_gmt":"2023-11-03T07:10:30","guid":{"rendered":"https:\/\/www.cigatisolutions.com\/blog\/?p=8594"},"modified":"2026-03-17T09:31:10","modified_gmt":"2026-03-17T09:31:10","slug":"solve-ost-is-not-an-outlook-data-file-error","status":"publish","type":"post","link":"https:\/\/www.cigatisolutions.com\/blog\/solve-ost-is-not-an-outlook-data-file-error\/","title":{"rendered":"Solve The File “OST is Not an Outlook Data File” Error in Outlook"},"content":{"rendered":"\n\n
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Microsoft Outlook, the ubiquitous email client, is an indispensable tool for countless professionals. However, even the most reliable software can throw an error from time to time. If you’ve ever come across the error message ‘OST is Not an Outlook Data File,’ you know that it can be a puzzling roadblock. Let’s explore the Outlook data files and why an OST file shouldn\u2019t be confused with an Outlook Data File (PST).<\/p>\n

The error message “The File OST is Not an Outlook Data File” typically occurs when there is an issue with Microsoft Outlook and its data files. Moreover, this error message suggests that Outlook has encountered a problem recognizing an OST (Outlook Offline Storage Table) file. The below section will show you the exact pop-up when this issue arises.<\/p>\n

\u201cCannot Start Microsoft Outlook. Cannot Open the Outlook Window. The set of folders cannot be opened. The file C:\\Users\\owner\\AppData\\Local\\Microsoft\\Outlook\\Outlook Data File.ost is not an Outlook data file (.ost).<\/em>\u201d<\/p>\n

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