I am getting the following error message from Outlook 2007 when performing a send/receive. 15:02:18 Microsoft Exchange offline address book 15:02:18 Not downloading Offline address book files. A server (URL) could not be located. 15:02:18 0X8004010F After trace the OAB gerneration process and publish to the OAB virtual web site is successful. I just find that the autodiscover.xml is not correct and nothing inside this file. it means the autodiscover service not generating new autodiscover.xml It is the content of the XML ?xml version="1.0" encoding="utf-8"?><Autodiscover><!-- This is a placeholder file --></Autodiscover> Any can help fix this? the result of get-outlookprovider | format-text CertPrincipalName : Server : dvn-hk-mail2007 TTL : 1 AdminDisplayName : ExchangeVersion : 0.1 (8.0.535.0) Name : EXCH DistinguishedName : CN=EXCH,CN=Outlook,CN=AutoDiscover,CN=Client Access,CN=DVN-HK,CN Identity : EXCH Guid : e28d743f-c65e-48bd-a486-9a5d3a6f8270 ObjectCategory : dvngroup.com/Configuration/Schema/ms-Exch-Auto-Discover-Config ObjectClass : {top, msExchAutoDiscoverConfig} WhenChanged : 6/11/2007 5:11:10 PM WhenCreated : 5/23/2007 2:05:20 PM OriginatingServer : DVN-HK-AD2007.dvngroup.com IsValid : True