1.从微软官网下载评估版



2.运行->CMD(管理员)->输入DISM /online /Get-CurrentEdition 看你的Edition ID是什么，如果是Evaluation的话，例如Standard一般就把ServerStandardEval后面Eval那四字母去了就是你的Edition ID。 如我的就是ServerStandard.


3.然后输入DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula  
Edition ID自己填刚才得到的那个，ProductKey后面把序列号填上去就行，这个方法也适用于Standard转DataCenter.此处ServerStandard就是第二步查出来的EDITION ID。
4.重启操作系统

5.使用Windows Loader或者oem激活.

关于第三步中的PRODUCT KEY，参考如下列表：
Operating system edition KMS Client Setup Key
Windows 8 Professional NG4HW-VH26C-733KW-K6F98-J8CK4
Windows 8 Professional N XCVCF-2NXM9-723PB-MHCB7-2RYQQ
Windows 8 Enterprise 32JNW-9KQ84-P47T8-D8GGY-CWCK7
Windows 8 Enterprise N JMNMF-RHW7P-DMY6X-RF3DR-X2BQT
Windows Server 2012 Core BN3D2-R7TKB-3YPBD-8DRP2-27GG4
Windows Server 2012 Core N 8N2M2-HWPGY-7PGT9-HGDD8-GVGGY
Windows Server 2012 Core Single Language 2WN2H-YGCQR-KFX6K-CD6TF-84YXQ
Windows Server 2012 Core Country Specific 4K36P-JN4VD-GDC6V-KDT89-DYFKP
Windows Server 2012 Server Standard XC9B7-NBPP2-83J2H-RHMBY-92BT4
Windows Server 2012 Standard Core XC9B7-NBPP2-83J2H-RHMBY-92BT4
Windows Server 2012 MultiPoint Standard HM7DN-YVMH3-46JC3-XYTG7-CYQJJ
Windows Server 2012 MultiPoint Premium XNH6W-2V9GX-RGJ4K-Y8X6F-QGJ2G
Windows Server 2012 Datacenter 48HP8-DN98B-MYWDG-T2DCC-8W83P
Windows Server 2012 Datacenter Core 48HP8-DN98B-MYWDG-T2DCC-8W83P
Windows 7 Professional FJ82H-XT6CR-J8D7P-XQJJ2-GPDD4
Windows 7 Professional N MRPKT-YTG23-K7D7T-X2JMM-QY7MG
Windows 7 Professional E W82YF-2Q76Y-63HXB-FGJG9-GF7QX
Windows 7 Enterprise 33PXH-7Y6KF-2VJC9-XBBR8-HVTHH
Windows 7 Enterprise N YDRBP-3D83W-TY26F-D46B2-XCKRJ
Windows 7 Enterprise E C29WB-22CC8-VJ326-GHFJW-H9DH4
Windows Server 2008 R2 Web 6TPJF-RBVHG-WBW2R-86QPH-6RTM4
Windows Server 2008 R2 HPC edition TT8MH-CG224-D3D7Q-498W2-9QCTX
Windows Server 2008 R2 Standard YC6KT-GKW9T-YTKYR-T4X34-R7VHC
Windows Server 2008 R2 Enterprise 489J6-VHDMP-X63PK-3K798-CPX3Y
Windows Server 2008 R2 Datacenter 74YFP-3QFB3-KQT8W-PMXWJ-7M648
Windows Server 2008 R2 for Itanium-based Systems  GT63C-RJFQ3-4GMB6-BRFB9-CB83V
Windows Vista Business YFKBB-PQJJV-G996G-VWGXY-2V3X8
Windows Vista Business N HMBQG-8H2RH-C77VX-27R82-VMQBT
Windows Vista Enterprise VKK3X-68KWM-X2YGT-QR4M6-4BWMV
Windows Vista Enterprise N VTC42-BM838-43QHV-84HX6-XJXKV
Windows Web Server 2008 WYR28-R7TFJ-3X2YQ-YCY4H-M249D
Windows Server 2008 Standard TM24T-X9RMF-VWXK6-X8JC9-BFGM2
Windows Server 2008 Standard without Hyper-V  W7VD6-7JFBR-RX26B-YKQ3Y-6FFFJ
Windows Server 2008 Enterprise YQGMW-MPWTJ-34KDK-48M3W-X4Q6V
Windows Server 2008 Enterprise without Hyper-V  39BXF-X8Q23-P2WWT-38T2F-G3FPG
Windows Server 2008 HPC RCTX3-KWVHP-BR6TB-RB6DM-6X7HP
Windows Server 2008 Datacenter 7M67G-PC374-GR742-YH8V4-TCBY3
Windows Server 2008 Datacenter without Hyper-V  22XQ2-VRXRG-P8D42-K34TD-G3QQC
Windows Server 2008 for Itanium-Based Systems  4DWFP-JF3DJ-B7DTH-78FJB-PDRHK