Upgrading from NT/5.5 to 2003/Exchange 2007

I am having an NT domina with Exchange 5.5 and we are thinking of moving to 2003 AD with Exchange 2007. I think there isn't a straight upgrade path from 5.5 o 2007. Is it right? And how about should I go about the upgrade? New 2003 domain with 2003 Exchange and then moving onto 2007?

What's the best way to go forward? Ideas welcome.
CromwellhospitalAsked:
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SembeeConnect With a Mentor Commented:
Users you are looking at either a manual creation or something like admt. Google ADMT, most of the first two pages have information on it, including its use for Exchange 5.5 migrations.

For content you would have to use exmerge. However that has an issue with Exchange 2007 as there is no server side PST import available. That will be fixed when Exchange 2007 SP1 is released - which should be soon.

Simon.
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SembeeCommented:
You basically have two choices.

1. Upgrade the existing site to Windows 2003 AD, then Exchange 2003, remove Exchange 5.5 etc. Then upgrade again to Exchange 2007. With care that can be done with close to zero downtime, but will not happen in a week - I usually suggest the work is spread out over two to three months. The change to AD is the biggest jump, and should be given a good couple of weeks to a month to settle down before you even think about changing Exchange versions.

2. A new domain with Windows 2003 and Exchange 2007. That will mean disruption for the business, I usually say at least a full production day will be lost, with further disruption for another week if not more, depending on how many users there on the network.

Simon.
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CromwellhospitalAuthor Commented:
How will we move the users and mailboxes to the new domain if I go with step 2?

Any documents?
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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