Evaluating any version of Windows Server 2008 R2 software does not require entering a product key, however will require activation within 10 days. Failing to activate the evaluation will cause the licensing service to shut the machine down every hour. Once activated, the evaluation will run for 180 days. After this time, you will need to uninstall the evaluation software and reinstall a fully-licensed version of Windows Server 2008 R2.


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http://care.dlservice.microsoft.com/download/7/5/E/75EC4E54-5B02-42D6-8879-D8D3A25FBEF7/7600.16385.090713-1255_x64fre_server_eval_en-us-GRMSXEVAL_EN_DVD.iso