About a month ago we transitioned from Exchange 2007 to 2010. I have everything moved over to the new 2010 server, but the old 2007 is still up and running for now. I read that I should leave it up long enough for most users to open Outlook so that the 2007 server can tell them that their mailbox is now located on the 2010 box.
Since the transition I have created two new mailboxes. Neither of them will show up in the GAL in the Outlook client. Both of them show up in the GAL when using Outlook Web App.
We only have one offline address book. In the properties of the default offline address book (in EMC>Organization Config>Mailbox>OAB tab) I have include the default global address list checked under the address lists tab, I have Outlook 2003 SP2 or later (version 4) checked under client support, enable web-based distribution is checked and the 2010 server is set as the distribution server under Distribution Points. I don't have enable public folder distribution checked because we don't use those.
I don't see anything in the logs that suggests a problem.