upgrading domain to windows server 2003

I may have already asked this but i do not see it in my history list.  I need help on how to get our existing windows 2000 server domain to a windows server 2003 domain.  WE HAVE 2 already one is on a windows 2000 and the other is windows 2003 domain controlllers.  we have exchange 2003 in place and wanna upgrade to 2007.  we have multiple domain controllers in our forest. i think 6 or 7 probably 6 we have only one domain name.  the domain controller is running in mixed mode now and we want to get it to native?   any exact steps on how to do this would be appreciated..  our dns server is on the windows 2000 box, our dhcp is on the same server as well.
scripttron75Asked:
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Erik PittiCommented:
This question is huge. I'd like some points of clarification if possible...

#of servers designated as domain controllers (DCs):

of the DCs, how many are performing other function (ex: DHCP):

how many physical locations are these domain controllers spread across:

how many users in your domain:

how many DCs running Windows 2000 and what version (SP1,2,3,4):

how many DCs running Windows 2003 and what version (SP1,2,R2):

how many DCs running Windows NT 4 (since you said you are running in mixed mode):

Exchange 2007 can be installed in an active directory that is being hosted on Windows 2000 servers as long as the schema master and global catalog DCs are runnng Windows Server 2003 and the domain is running in at least Windows 2000 native mode.

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How to raise domain and forest functional levels in Windows Server 2003:
http://support.microsoft.com/kb/322692

Background on AD functional levels: Know Your Functional Levels Part I ~ IT Professionals
http://www.lockergnome.com/it/2005/04/13/know-your-functional-levels-part-i/

Exchange 2007 Install Documentation:
http://www.msexchange.org/tutorials/Installing-Exchange-2007-Part1.html
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scripttron75Author Commented:
This question is huge. I'd like some points of clarification if possible...

#of servers designated as domain controllers (DCs): HOW DO I FIND THIS OUT

of the DCs, how many are performing other function (ex: DHCP):

how many physical locations are these domain controllers spread across:

how many users in your domain: HOW DO I FIND THIS OUT?

how many DCs running Windows 2000 and what version (SP1,2,3,4): in looking at my active directory and right clicking on the top level, selected properties and the connect to domain controller there are 7 in there.  but on says exchange.ourdomain.com the other six are standard domain controllers in our LA office, in china ( i cant remote that server) cologne germany, basel germany and another basel.  we have 2 windows 2000 servers one is server and the other in basel is windows 2000 advanced server teh advanced server in besel has SP3 on it,  our la office windows 2k server has SP4 on it..

how many DCs running Windows 2003 and what version (SP1,2,R2):looks as if we have 3 dc's we have one i our LA office with standard edition with SP1 on it,  our cologne office has standard edition with SP2 on it, our basel office has server 2003 standard with sp1.

how many DCs running Windows NT 4 (since you said you are running in mixed mode): none

Exchange 2007 can be installed in an active directory that is being hosted on Windows 2000 servers as long as the schema master and global catalog DCs are runnng Windows Server 2003 and the domain is running in at least Windows 2000 native mode.
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Windows Server 2003

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