Outlook Web Access was unable to initialize..A base theme could not be found. The base theme must be in a folder with the name “%1”.

Details
Product: Exchange
Event ID: 26
Source: MSExchange OWA
Version: 8.0
Symbolic Name: NoBaseTheme
Message: Outlook Web Access was unable to initialize..A base theme could not be found. The base theme must be in a folder with the name “%1”.
   
Explanation

This Error event indicates that Microsoft® Office Outlook® Web Access did not initialize because the Outlook Web Access base themes folder referenced in the event description does not exist. The base folder contains images and cascading style sheets that are used to control the default appearance of Outlook Web Access for your organization. The base folder is also used by other custom Outlook Web Access themes if they are installed. By default, the base folder is located in C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\<version> hemes\.

   
User Action

To resolve the error, replace the base folder and its contents with the files and folders that are located on the Microsoft Exchange Server 2007 DVD. By default, the base folder is located in the \Setup\ServerRoles\ClientAccess\owa\version hemes folder of the Exchange 2007 DVD.

For more information about Outlook Web Access themes, see How to Create a Theme for Outlook Web Access.

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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