I want to flip the DNS to point to the CAS, but I need to enable intergrated windows auth on the activesync directory on the 2003 box. But the option is greyed out See http://i.imgur.com/PSeLZ.png I should be doing this on the 2003 BE not the 2003 FE, correct?Enterprise technology blog

Make sure you have the hotfix installed on the 2003 backend: http://support.microsoft.com/?kbid=937031

Hello, You can change the authentication method for ActiveSync VDir via IIS manager. Thanks, Simon

Hi, Any update on the issue?Gulab | MCITP: Exchange 2010-2007 | Lync Server 2010 | Windows Server 2008 | Skype: Exchange.Ranger | Blog: www.ExchangeRanger.Blogspot.com

it was the hotfix. Our exchange 2003 is part of a cluster and I had patched the passive node but not the active node because you have to take the cluster service offline to install the patch. I've been working though cert issues the rest of the weekend :) thanks!Enterprise technology blog