So you mean the user account and domain where the exchange is placed is different AD domains (but in the same forest)? Sarbjit From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of jitendra singh Sent: Friday, June 26, 2009 1:22 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Exchange 2007 Mailbox for other child domain users Dear All, I have 1 AD doamin by the name of surya.local with 2 child domains india.surya.local & newyork.surya.local. Exchange 2007( EXCH2K7) is installed with india.surya.local. Both child domains have their own users. And E mail for suryafashions.com(Authoritative domain) is working fine with india.surya.local. Now my requirement is . How to create mailbox for the users of newyork.surya.local in Exchange 2007(EXCH2K7) which is placed in india.surya.local (child domain) while users are created in newyork.surya.local. I asked my one of the friend for this task and he replied to run domain prep in newyork.surya.local & than create mailboxes. Best Regards, Jitendra Singh Data Centre Officer Caliber Tech Solutions Pvt. Ltd. B1/J2,MCIE, New Delhi-44 India +91-9810078189 <http://sigads.rediff.com/RealMedia/ads/click_nx.ads/www.rediffmail.com/sign atureline.htm@Middle?>