A new Exchange (5.5 or 2003) to not interfere with current Exchange 5.5 network!

All expert opions welcomed!

I have an Exchange 5.5 site in a Windows 2000 environment under one domain. I need to install another Exchange that would recieve messages from the 5.5 Exchange and strictly perform for journaling. The question here is what is the best configuration to eliminate disrupting the current 5.5 setup?

I am trying to make the argument that a sub domain, under which an Active Directory (with GC) and an Exchange (possibly 2003) would be installed. Would this be a good way in separating the new Exchange from the Exchange 5.5 site? Would the AD with Exchange 2003 have any problems with the original AD that is couple with 5.5?

My Tech Chief wants the Exchange 2003 to be in the same domain, but I get from other experts that this requires the use of ADC and may interfere because it is a partial migration, a big headache.

I need this installed asap, with proper planning ofcourse, so I am assuming another domain or another installation of 5.5 in the same domain is the best setup. What do you think?

All expert opions welcomed!
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HackLifeAsked:
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cokeefe77Commented:
Well, if you install it in another domain, the headache would come from you having to go to each machine and join the machine to the new domain.  Coping profiles so the users would not notice the difference, and then configuring the e-mail clients.  What you are asking is "what is better? an inplace or parallel migration"  Since you have AD already installed, the best bet would be to install Windows 2003 server in the same domain.  Extend the schema to allow 2003 server to participate in Active Directory.  Run DCPromo on the 2003 Server.  Change all FSMO roles to this server.  Extend the schema for Exchange 2003 and install the ADC.  Perform a mailbox move from Exchagne 5.5 to Exchange 2003.  Then reinstall the 2000 server to 2003 server.  After the migration, reinstall the Exchagne 5.5 server to Exchange 2003.  Do this all the time and works perfectly.  The seperate domain is only good for LONG Term migrations.  You still have a lot of creative policy writing to do so that mail routing works flawlessly while preserving the REPLY to address of the original domain.  INPLACE, INPLACE,INPLACE.  Your users will not notice the difference and this can be done fairly quickly.

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