Integrated Windows authentication of '{3}' needs to be enabled on the Exchange 2003 back-end server {2} in an Exchange Server ...

Integrated Windows authentication of '{3}' needs to be enabled on the Exchange 2003 back-end server {2} in an Exchange Server 2007/Exchange Server 2003 mixed environment to allow for mobile device synchronization. Please follow the steps listed in http://support.microsoft.com/kb/937031 to enable Integrated Windows authentication for the '{3}' virtual directory.