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pramod1
pramod1 used Ask the Experts™
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I have been asked below

there IS ONE (Windows server 2003)and  the new  replacement server built  for is  Windows 2008 R2 since Windows 2003 is EOS,  if it is promoted to DC then that would upgrade the Schema. Please let us know if we can proceed.

what does EOS mean, also why it is necessary to upgrade schema
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Seth SimmonsSr. Systems Administrator
Commented:
what does EOS mean

windows 2003 is end-of-life as of july 14 which means microsoft no longer supports it - you can't call them for support and they no longer provide any security updates

also why it is necessary to upgrade schema

with newer versions of windows, newer objects in AD are available so you need to update the schema to allow for that before promoting the first domain controller of a newer version of windows

in your case, you need to run adprep (or adprep32 if your 2003 server is 32bit) from the 2008 media first before you run dcpromo on the 2008 server

Running Adprep.exe
https://technet.microsoft.com/en-us/library/Dd464018%28v=WS.10%29.aspx
Senior Solution Architect
Most Valuable Expert 2015
Top Expert 2015
Commented:
if it is promoted to DC then that would upgrade the Schema. Please let us know if we can proceed.

The answer is No. You need to run the forest/domain preps on your 2003 server before you can promote your 2008R2 member server as a DC. Once you have successfully preped the domain and forest then you can promote your 2008R2 server to a DC. Also make sure that your account has Schema amdins, enterprise admins, and domain admins group membership.

In Server 2012 this AD prep is done automatically.

Check out the below link for additional details
https://technet.microsoft.com/en-us/library/cc754670(v=ws.10).aspx

Will.

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