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You cannot open a mailbox that has a "#" character in the primary SMTP email address by using OWA in an Exchange Server 2007 environment
Article ID: 2517337 - View products that this article applies to.
Consider the following scenario:
HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
This issue occurs because the URL is interpreted incorrectly by the explicit-logon method that is used in OWA 2007.
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/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.
Article ID: 2517337 - Last Review: July 7, 2011 - Revision: 1.0