Prerequisities:

1. Forefront Identity Manager 2010 (Synchronization service)

2. LDAP communication between the FIM server and the destination domain controller

3. RPC access between the FIM server and the destination Exchange server

Scenario:

There are two different forests named Forest1 and Forest2 with domain controllers and Exchange servers DC1/Exc1 and DC2/Exc2 respectively

Steps:

1. Install Forefront Identity Manager 2010 server FIM1 (Only FIM Synchronization service is required, FIM service is not mandatory). Only on Forest1

2. Test LDAP connectivity between FIM1 and DC2 and RPC connectivity between FIM1 and Exc2.

3. Create a service account in each forest with the name Galsync with domain admin permissions which we will use for domain authentication

4. Create 2 management agents in FIM, one for source Forest1 and one for destination Forest2 and call them MA1 and MA2

5. Enable provisioning rules extension on the FIM Sync

6. Configure and run "Run Profiles" in FIM sync for each forests in the following order for Global address book synchronization

a. Full Import on MA1 > Full Import on MA2 > Full Sync on MA1 > Full Sync on MA2 > Export on MA2 > Export on MA1

 

These steps shoud help sync Global address lists between organisations. Please follow this simple video for a demonstration

http://technet.microsoft