How to update OCS external address book urlhttp://blogs.technet.com/exchangept/archive/2009/05/20/how-to-update-ocs-external-address-book-url.aspxHere’s how to update the external address book url:   Lcscmd /web /action:updatepoolurls /externalwebfqdn:<WebfarmFQDN> /poolname:<poolname more info:   http://technet.microsoft.com/en-us/library/bb803611.aspxen-USCommunityServer 2.1 SP1 (Build: 61025.2)