OALGen detected that the file ‘%1’ is corrupted or missing. This indicates data tampering or disk problems. Restore files in this folder from the recent backup or clean up folder content and force a full OAB generation. – %2

Details
Product: Exchange
Event ID: 9373
Source: MSExchangeSA
Version: 8.0
Symbolic Name: evtOALFileChangedOnShare
Message: OALGen detected that the file ‘%1’ is corrupted or missing. This indicates data tampering or disk problems. Restore files in this folder from the recent backup or clean up folder content and force a full OAB generation.
– %2
   
Explanation

This Error event indicates that one or more version 4 offline address book (OAB) files are corrupted or missing. Microsoft Outlook clients cannot download the updated files.

   
User Action

To resolve this Error event, do one or more of the following:

  • If daily backups are available, restore the content of the OABGen folder to the <ExchangeInstallDir> \ExchangeOAB\ <OAB GUID> folder (where <ExchangeInstallDir> is a placeholder for the installation directory of Microsoft Exchange Server 2007 and <OAB GUID> is a placeholder for the name of the folder).

  • If the corrupted OAB item is enabled for public folder distribution and the data has been published to public folders before the OAB item was corrupted, you can delete the contents of the OABGen folder from the <ExchangeInstallDir> \ExchangeOAB\ <OAB GUID> folder and rebuild the OAB files by updating the OAB. For more information about how to update the OAB, see How to Update the Offline Address Book.

  • If neither daily backups nor public folder distribution is enabled, delete the contents of the OABGen folder from <ExchangeInstallDir> \ExchangeOAB\ <OAB GUID>, and then rebuild the OAB files by using the following command in the Exchange Management Shell:

    Update-OfflineAddressBook <OABGuid>

    This command will cause a full OAB download by all clients. A full OAB download can cause massive network traffic between Client Access servers and clients.

  • If you are having difficulty resolving the issue, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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