I am trying to set up my work computer with Outlook. When I am trying to do the exchange server for Entourage, I put in all the correct fields, but when I click the 'verify settings' icons to verify - it gives me a an error. ERROR - 17900 I have the new 21.5" iMac with the ATI graphics card running Snow Leopard. If anyone can help that would be greatly appreciated. Thanks... I appreciate any help!