Yes
Mode doesn't matter when you are placing a 2003 dc into the domain, just if
you wanted to change the mode then you need to know which dc's belonged to
the domain.
This isn't a easy answer to this not so "easy question." Once you make the
2003 machines member servers you will need to know which machines hold the
fsmo roles for the domain. To find this out key the following at a command
prompt
netdom query fsmo
You will then need to run adprep on your forest on the schema master role
holder and adprep on the domain on the infrastruture master fsmo role
holder. Finally promote a 2003 member server to a DC.
Once you have both 2003 dc's promoted you will then need to decommission the
older dc's. I have an article on how to do this as listed below.
Note most installations that have AD seem to also have Exchange, this is a
big piece in the upgrade. You have to deal with additional issues (Such as
mangled attributes) that I haven't covered. For a complete detailed list on
how to do the upgrade see the first link below, this will also cover the
Exchange piece.
Complete set of instructions to upgrade to 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;325379
Decommissioning a DC
http://pbbergs.dynu.com/windows/articles.htm Select Decommission a DC.
Best of luck
--
Paul Bergson MCT, MCSE, MCSA, CNE, CNA, CCA
This posting is provided "AS IS" with no warranties, and confers no rights.