Forgot to specify your reverse proxy during OCS setup?

If you forgot to do this during setup, or you just plain didn't know what the external name was going to be and now addressbook lookups don't work from the outside, there is hope!

LCSCMD to the rescue. You may find this under

\Program Files\Common Files\Microsoft Office Communications Server 2007\

The command line for changing or updating the reverse proxy FQDN is:

Lcscmd /web /action:updatepoolurls /externalwebfqdn:externalreverseproxyurl /poolname:yourpoolname
where externalreverseproxyurl should be in the form of and yourpoolname  is the 
name of the OCS standard server or internal poolname of your OCS enterprise deployment.