Select Settings, and then in the Microsoft Exchange dialog, select Advanced.In the Account Settings dialog, select Data Files, and select the file for Mailbox.On the Tools menu in Outlook, select Account Settings.Restart Outlook and allow a new OST to be created. With Outlook closed, in Windows Explorer, navigate to the path and file determined in step 3, and then delete the. Locate the OST file for your email address, and note the path and filename of the OST file.Ĭlose all dialog boxes, and then close Outlook. In the Account Settings dialog, select Data Files. On the File tab, select Account Settings, and then select Account Settings. If that fails, then creating a new Outlook profile will resolve the issue. The error may be resolved in Outlook 2016, Outlook 2013 or Outlook 2007 by deleting and recreating the Outlook Cached Mode OST file. The cause of corruption has never been determined. This error has been associated with Outlook Data File (OST) corruption. This error may appear alone, or accompany other actions or conditions, such as Send/Receive, missing email, or slow synchronization with Exchange Server. Using a Cached Mode profile, in Microsoft Outlook you see the following error in messages with the subject Synchronization Log in the Sync Issues folder:

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