"HTTP Error 400 Bad Request" error message when you use OWA to log on to a newly created Exchange Server 2007 mailbox

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Article ID: 2484147 - View products that this article applies to.
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Consider the following scenario:
  • In a mixed Microsoft Exchange Server 2010 and Microsoft Exchange Server 2007 environment, an Exchange Server 2010 Client Access server handles the proxy requests for the Exchange Server 2007 Client Access server.
  • You create a new mailbox on an Exchange Server 2007 server.
  • You log on to this mailbox by using Outlook Web App (OWA).

    Note This is the first time that you log on to this mailbox.
  • You are automatically routed to the language selection page in OWA.
  • You select a language, and then you click the OK button.
In this scenario, you receive the following error message:
HTTP Error 400 Bad Request


To resolve this issue, install the following update rollup:
2509911 Description of Update Rollup 4 for Exchange Server 2007 Service Pack 3


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about Proxying and Redirection, visit the following Microsoft website:


Article ID: 2484147 - Last Review: July 7, 2011 - Revision: 1.0
  • Microsoft Exchange Server 2010 Service Pack 1, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
kbqfe kbfix kbhotfixrollup kbexpertiseinter kbsurveynew KB2484147

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