PFs not replicating to Exchange 2007 in mixed organisation
In a mixed Organisation where we have Excvhange 2000 or 2003 when content or the hierarchy isn't replicating over to the Exchange 2007 side this can be caused by the E2k7 server not having permissions on the E2k3 server or PF store.
Also we may see the event 3113 logged in the Application logs ("There was a problem retrieving the list of public MDBs associated...")
The easiest way to do a quick check is to run BPA (Best Practice Analyser) (www.exbpa.com) in healthcheck mode and see if it logs any permissions errors.
If so, or if you want to check this can be done in AdsiEdit and check the Exchange 2003 server object and that "Allow inheritable permissions from the parent to propagate...." is checked.
It should also have all the permissions from "Access Recipient Update Service" down to the bottom of the list.
This should be the same for the PF store on the 2003 server.