This Error event indicates that the user referenced in the event description did not save his or her primary language setting for Microsoft Office Outlook Web App. The setting determines the language the program will use for all items and also the date and time settings displayed in Outlook Web App for the user. This event may occur if one or more of the following conditions are true:

• The mailbox was created by using the Active Directory Users and Computers snap-in instead of the Exchange Management Console or Exchange Management Shell.
  
  
• The msExchVersion value that is stored in Active Directory for a user does not match to the msExchVersion value that is stored on the server where the user's mailbox is located.
  
  

Note:

Microsoft Exchange Server 2007 mailboxes should not be created through the Exchange Server 2003 extensions to the Active Directory Users and Computers console because this is not supported. If you create an Exchange 2007 mailbox with this tool, it will be identified as a legacy mailbox, even though it resides on an Exchange 2007 server. Use the Set-Mailbox cmdlet with the ApplyMandatoryProperties parameter to modify the mandatory properties of a mailbox in this state to correct the problem and remove the legacyMailbox tag from the mailbox.

• To resolve this error, modify the mandatory properties of the user mailbox specified in the event description. You do this by running the Set-Mailbox cmdlet with the ApplyMandatoryProperties switch. For example, in the Exchange Command Shell, run Set-Mailbox -Identity <UserAlias> -ApplyMandatoryProperties. For more information about the Set-Mailbox cmdlet, see Set-Mailbox.
  
  
• Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.
  
  

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.