I just installed an installation of Zimbra and have everything working except the GAL. I've created several users in several different domains with different galsync accounts, but when I open up a user's mail and go to the address book it is empty when I search the Global Address List.
I used the defaults when going through the install and had no problems, and the only changes I've made to the installation since starting it up are to follow the postfix changes here:
Split domain with Exchange 2003 as Primary - Zimbra :: Wiki which don't seem to me as something that would affect the GAL.
Thanks!