Our plan is to setup a main domain in the head office and child domain for 16 sub-offices. we need to setup exchange & AD to the head office and each 16 sub-offices. Each offices are connected via leased lines. All offices should have a single global address list. Is there a link for a step by step configuration for this? I'm a newbee with exchange 2010

Thanks guys for your help. We decided to centralized the exchange to HQ and put RODC to 16 sub-offices