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Thank you both, very informative.
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We have two old servers, one is running Windows server 2003 the other one 2000. We need to upgrade, but can Windows 2012 server run with 2003? I would like to have two servers as back ups for each other. I would like to see if we need to purchase one or two new servers. thanks!
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We have two old servers, one is running Windows server 2003 the other one 2000. We need to upgrade, but can Windows 2012 server run with 2003? I would like to have two servers as back ups for each other. I would like to see if we need to purchase one or two new servers. thanks!

Windows Server 2012 with 2003 - can they run together

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

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).