Hi almassude, I think u may confuse with my information, actually, we have 1 DC, 1ADC and 70 Child domains at remote locations these r all in a single forest. And we installed Enterprise edition Exchange server 2003 installed in ADC. And all Child domains installed exchange server 2003 standard edition. I think it?s not a big complex setup. Anyway, thanks for Ur valuable suggestion. If u found any solution pls get back to me. Thanks Almassude.