Today we released a patch for IIS7 in Windows Vista that addresses an issue we've seen with CGI applications (especially PHP applications that use the built-in CGI component). The typical symptom is an application that runs using CGI and is unable to support multiple "cookies" for authentication or personalization.
If you are using CGI for an application on Windows Vista and are affected, you can read more information about this fix and download the patch here: http://www.microsoft.com/downloads/details.aspx?familyid=9dba1a94-1885-4038-af1d-a1e51d6ec8f8&displaylang=en&tm for more information, there is a KB article posted here: http://support.microsoft.com/kb/932385
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