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To change, or add a language in a Windows Server 2008 R2 system, you need to download a language pack ISO from Microsoft download site.

You can find it here
Then you need to install it; but Microsoft documentation if obscure on this argument....

The faster way is to execute this command lpksetup from Start->Run

and choose the cab file from the language pack dir you want add.

That's all, follow the instruction an you are done.

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