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Can you give us more detail?<br />
Is exchange involved?<br />
Is it a domain or standalone server?<br />
New hardware or same hardware?
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Can you give us more detail?
Is exchange involved?
Is it a domain or standalone server?
New hardware or same hardware?

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Yes, more details are needed.<br />
<br />
What are you upgrading to?
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Yes, more details are needed.

What are you upgrading to?

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Here are some mirgration guides to upgrade your AD to Windows 2008 from Windows 2003 but I'm not for sure if this is the information you need.<br />
<br />
<a href="https://www.experts-exchange.com/questions/23665224/Windows-2008-Server-Migration-From-Server-2003.html" rel="ugc">https://www.experts-exchange.com/questions/23665224/Windows-2008-Server-Migration-From-Server-2003.html</a><br />
<br />
Some more info from you would help us out. 
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Here are some mirgration guides to upgrade your AD to Windows 2008 from Windows 2003 but I'm not for sure if this is the information you need.

https://www.experts-exchange.com/questions/23665224/Windows-2008-Server-Migration-From-Server-2003.html [https://www.experts-exchange.com/questions/23665224/Windows-2008-Server-Migration-From-Server-2003.html]

Some more info from you would help us out.

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It is the same hardware eg server.<br />
<br />
It is now running Server 2003 standard and I want it to run Server 2008 standard
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It is the same hardware eg server.

It is now running Server 2003 standard and I want it to run Server 2008 standard

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I really don't recommend doing a in-place upgrade of a system since I have ran into issues. Also, you will be bringing problems from the Windows 2003 install into your new Windows 2008 install.
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I really don't recommend doing a in-place upgrade of a system since I have ran into issues. Also, you will be bringing problems from the Windows 2003 install into your new Windows 2008 install.

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How to upgrade
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how to upgrade server 2003

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.