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I second 2008 R2. &nbsp;Seems more stable. &nbsp;
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I second 2008 R2.  Seems more stable.  

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Another vote for 2008 R2. Plus it seems Windows 7 / 2008 R2 SP1 will be released to the public on 2/22/11.
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Another vote for 2008 R2. Plus it seems Windows 7 / 2008 R2 SP1 will be released to the public on 2/22/11.

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I am having a forst of windows 2003 standard i want to join one ADC server 2008 standard to my existing forest please tell me the proper process or guidance to complete this project.
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I am having a forst of windows 2003 standard i want to join one ADC server 2008 standard to my existing forest please tell me the proper process or guidance to complete this project.

ADC 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).

Windows Server 2003

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

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.