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

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: 07/07/2011 14:45:00 - Revision: 1.0

Microsoft Exchange Server 2010 Service Pack 1

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