How I can upgrade the active directory 2003 to 2008 R2.

How I can upgrade the active directory 2003 to 2008 R2. My DNS/DHCP etcin the same active directory server. I have 500 users in the domain.
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Iamthecreator OMIT AdminCommented:
You can find all the necessary documentation at the following link.

Migrate Server Roles to Windows Server 2008 R2

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First take system state backup & then uphgrade the schema using adprep32(32 bit version) or adprep(x64) on DC holding fsmo.
If i assume you have dc with 32 bit OS run
Adprep32 /forestprep - Run on Schema master
Adprep32 /domainprep - Run on infrastructure master
Adprep32 /domainprep /gpprep - Infrastructure master
adprep32 /rodcprep  - On any DC
Verify the object version in schma partition which has to be 47 after upgrade.
So what you will need is a new Win 2008 r2 that you are going to use as the new dc.
adprep is located on the win 2008 r2 install cd
  1. You will need to update your schema so on the pdc master run adprep/forestprep
  2. If this runs good then adprep/domainprep
  3. If you are not going to use any rodc dc then you are done with schema updates.
  4. Join the 2008 server to the domain and dcprom it to a dc. Also make is part of AD integrated dns
  5. Give everything time to finish replication then move the fsmo roles off your old dc
 to 2008. Then move the dhcp and authorize it.
  6. dcpromo down your old dc and take it offline

  Good luck
Mike KlineCommented:
Is your 2003 server x32 or x64, if it is 32 bit then  you can't do an "upgrade in place" meaning because 2008 R2 is only 64 bit you can directly upgrade the current 2003 DC

In that case you will have to build new 2008 R2 servers

Quick high level steps.

1.  Prep your forest and domain.  The 2008 R2 prep for has an adprep32 and adprep.  If your 2003 box is x32 then you use adprep32.
2.  Install a 2008 R2 member server (this could have also been step 1)
3.  Use dcpromo to promote the box
4.  By default the 08 dcpromo will make it a global catalog also make it a DNS server
5.  After the reboot make sure replication is working
6.  Once you are ok with that made sure AD/DNS replication is working (assuming you are using AD integrated DNS) then check sysvol
7.  Transfer FSMO roles to the box
8.  Make sure clients (static and DHCP) are now also pointing to this box for DNS
9.  Then when you are ready you can shut the 2003 box down or turn of the ports (I always do that to make sure I didn't miss anything)
10.  Once you are ok with the 2008 R2 box and that everything is working you can run dcpromo and demote the 2003 boxes/
11.  I would personally leave them as member servers and have DHCP run on them, but that can be moved over to the 2008 R2 box too
12.  Once you know you will never need or introduce another 2003 DC then you can raise your domain and forest functional levels to 2008 R2
13.  Enjoy all the cool new features like the AD recycle bin, fine-grained passwords.

Meinolf also has a great blog entry on this topic

On another note the mike robbins link is good but just note that is for server core (which is a valid DC option but just be comfortable with the command line)


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