Hi Darwin, I hope that I am understanding correctly what you plan on doing. Exchange 5.5 can exist in a 2000 / 2003 Active Directory structure, however since Microsoft is dropping support for it, you may want to consider migration to Exchange 2003. However if your management decides not too.. You should install just run the active directory connector, although it will run with out it. If you want to install Exchange 5.5 on Windows 2000 server, You just need to make sure that you have the Exchange 5.5 service pack 3 and above. http://www.Microsoft.com/technet/prodtechnol/exchange/55/deploy/upgrade2000qi.mspx For the pro's and con's, just look at the feature diffrences in both products on Microsoft's website for Exchange at http://www.microsoft.com/exchange/default.mspx . Microsoft has a wealth of Knowledge on this subject. Jose -----Original Message----- From: Darwin O. Solano [mailto:dar.solano@xxxxxxxxxxxxxx] Sent: Monday, June 06, 2005 9:29 AM To: [ExchangeList] Subject: [exchangelist] Migrating NT4.0 Domain to W2K3 AD, but leaving Exchange 5.5 on. http://www.MSExchange.org/ Hi Gurus... Have you ever seen the case that a customer or corporation migrate the Whole domain to Windows 2K3 and leave the Exchange Server 5.5 on running on Windows NT4.0, and no plan to migrate it, all they want to do is migrate the server to Windows 2000. How can we do this?, Are there any constraints?, What are the risks? Is there a roadmap to do this? Thanks in advance. Darwin Solano IT Project Manager ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: jmedeiros@xxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx