Since you mentioned having multiple sites, your biggest advantages with 2003
over 2000 will be the improved Inter-Site Topology Generator (generates
replication connections between sites), improved global catalog replication,
more flexible dcpromo options (install from media), and better group
membership replication (link-value replication) - to name a few.
As far as domain rename goes, this is not supported in Exchange 2000/2003 so
you may not want to use that in your argument.....just be sure to carefully
plan you dns domain name before upgrading.
Here are some links with more information about new features and upgrading
to 2003:
http://www.microsoft.com/windowsserv...directory.mspx
http://www.microsoft.com/windowsserv...s/default.mspx
http://www.microsoft.com/windowsserv.../top10w2k.mspx
http://www.microsoft.com/windowsserv...e/top10nt.mspx
http://www.microsoft.com/windowsserv...nt4townet.mspx
--
Jimmy Harper [MSFT]
Directory Services
This posting is provided "AS IS" with no warranties, and confers no rights
"stephenbbaker" <(E-Mail Removed)> wrote in message
news

C6C2CAF-DF7D-42D4-929A-(E-Mail Removed)...
> We are required to upgrade our single NT 4.0 domain to Active Directory -
this has been a long planned process and we are finally ready to proceed.
We have a collection of sites that are all part of the domain and we would
like to keep our groups structure intact. We are running Exchange 5.5
servers with plans to upgrade to Exchange 2000.
>
> What arguments can we use to upgrade to 2003 versus 2000? The biggest
benefits I see would be the ability to rename the domain without having to
rebuild everything and the ability to migrate users' passwords into the
active directory.
>
> Suggestions? Comments?