To do the migration from 5.5 to Ex2k you will have to have a EX2K box to migrate all your ex5.5 user mailboxes to. To have EX2K you need Active Directory and to have the co-existence of 5.5 and AD you will need to change the LDAP port on your EX5.5 box as Active directory uses the port number 389 by default. You can pick any port number you want, provided it is free and not a commonly used one, but Microsoft usually recommend 390 anyway for easy of use, and because I guess it is easy to remember. -----Original Message----- From: windows2000-bounce@xxxxxxxxxxxxx [mailto:windows2000-bounce@xxxxxxxxxxxxx]On Behalf Of Steve Rance Sent: 15 September 2003 09:07 To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: Slightly OT:Exchange 5.5 or 2000 on 200 Server Colin, No...you HAVE to have AD to run Exchange 2000. There is no way around this one. Other than that then you can do everything else you ask. Steve -----Original Message----- From: White, Collin [mailto:cwhite@xxxxxxxxxxxxxx] Sent: 12 September 2003 20:55 To: 'windows2000@xxxxxxxxxxxxx' Subject: [windows2000] Slightly OT:Exchange 5.5 or 2000 on 200 Server Hello, I have a situation where I have an existing Exchange 5.5 server on NT 4.0 that is on it's last legs. What I would like to do is to install a fresh copy of Windows 2000 server on a new machine, install Exchange 2000, and then migrate the 5.5 information to the exchange 2000 machine. I am not running in an active directory environment, the 2000 server would simply be a member server in a NT 4.0 Domain. Is this possible? Thanks, Collin White This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. Thank you.