To fix sql server 2008 r2 Evaluation period has expired by change the key

PTTFM-X467G-P7RH2-3Q6CG-4DMYB

数据中心版：PTTFM-X467G-P7RH2-3Q6CG-4DMYB   测试可用

开 发者 版：MC46H-JQR3C-2JRHY-XYRKY-QWPVM

企    业 版：R88PF-GMCFT-KM2KR-4R7GB-43K4B

标    准 版：B68Q6-KK2R7-89WGB-6Q9KR-QHFDW

工 作 组版：XQ4CB-VK9P3-4WYYH-4HQX3-K2R6Q

WEB    版：FP4P7-YKG22-WGRVK-MKGMX-V9MTM

SQL Server 2008 R2 Management Studio : “Evaluation period has expired”

How to change the key:

open installation disk, click setup, click maintenance on the ‘sql server installation center‘ wizard, click ‘Edition Upgrade‘ on the right of the wizard window.

原文：http://www.cnblogs.com/zyip/p/3542714.html