Aamir, Try watching http://msevents.microsoft.com/cui/WebCastEventDetails.aspx?culture=en-us&EventID=1032262237&CountryCode=US and http://www.microsoft.com/exchange/community/webcasts.mspx these webasts are very helpful. If I were you I would migrate to Exchange 2003 as the Active Directory Connector has been improved considerably and it is much easier to configure then the version provided with Exchange 2000. The documentation on the Exchange 2000 & 2003 CD ROM are also very helpful. Sincerely, Jose Medeiros MCP+I, MCSE, NT4 MCT www.ntea.net www.tvnug.org www.sfntug.org ------------------------------------------------------ -----Original Message----- From: Aamri [mailto:aamir.aziz@xxxxxx] Sent: Tuesday, May 03, 2005 3:17 AM To: [ExchangeList] Subject: [exchangelist] Integrating Exchange 5.5 and Exchange 2000 http://www.MSExchange.org/ Hi I have Exchange 5.5 server (as the first server in the org) and i want to install Exchange 2000 server in the same site how do i do it? and if i use x.400 connector on both sides will they be able to communicate. Would appreciate if some one could help me out. Thanks Aamir