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How to upgrade windows 2008R2 standard to datacenter

Is it possible to upgrade from windows2008 R2 server standard to datacenter without installation work ?
 I mean, Is this just completed by input new license code of datacenter edition ?
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shouichi
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shouichi
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Sushil SonawaneCommented:
It's is possible.

Please refer below link to Upgrading Windows Server 2008 R2 without media

(http://blogs.technet.com/b/server_core/archive/2009/10/14/upgrading-windows-server-2008-r2-without-media.aspx)

Windows Server 2008 R2 introduces a new command-line utility, DISM, the Deployment Image Servicing and Management tool.    One of DISM’s many useful features is the ability to use its edition-servicing commands to upgrade an R2 installation without requiring install media.  This is functionally equivalent to Windows Anytime Upgrade in a Windows 7 client install, and can be performed on both an online or offline image, and on both full Server and Server Core installations.


(http://social.technet.microsoft.com/Forums/en/windowsserver2008r2general/thread/ce1a80c6-ac89-442b-8680-0cc11e3caec2)

(http://techontip.wordpress.com/2012/04/05/upgrade-windows-2008-r2-standard-to-enterprisedatacenter-without-media/)
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