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We have 2 domain controllers running Windows Server 2003 R2 Standard that we would like to upgrade to Windows 2008 R2 Standard.<br />
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What is the best upgrade path/method to use here?
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We have 2 domain controllers running Windows Server 2003 R2 Standard that we would like to upgrade to Windows 2008 R2 Standard.

What is the best upgrade path/method to use here?

Upgrading Server 2003 R2 to Server 2008 R2

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.

Windows Server 2008

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).