One org per AD forest. Install in the same forest, and you have essentially joined the existing exchange org. _____ From: Ivan Dwi Handono [mailto:ivan.dwi@xxxxxxxxxxxxxxxx] Sent: Saturday, October 15, 2005 12:15 AM To: [ExchangeList] Subject: [exchangelist] Join Exchange 2003 http://www.MSExchange.org/ Guy's, Now I try to setup another Exchange 2003 and I want to join with existing exchange 2003. How to join ?