给朋友装上了英文版的Office 2010，被问之能否切换界面成日文。试了一下，从微软网站直接安装语言包需要美金开路。

但是伟大的人们群众已经提供了完整的资源包链接。

下载后点选安装，安装结束后可在文件(File)-选项(Options)-语言(Language)中选择切换默认语言包。或者【开始菜单】→【Microsoft Office】→【Miecrosoft Office 2010 工具】→“Microsoft Office 2010 语言首选项"
直接修改编辑语言和界面语言和帮助语言即可。

Language Pack Direct Download:

Arabic

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37621.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37685.exe

Brazilian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37623.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37687.exe

Chinese Simple

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37627.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37690.exe

Chinese Traditional

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37628.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37692.exe

Croatian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37630.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37694.exe

Czech

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37632.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37695.exe

Danish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37633.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37697.exe

Dutch

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37635.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37699.exe

English

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37637.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37701.exe

Finnish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37640.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37705.exe

French

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37642.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37707.exe

German

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37644.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37709.exe

Greek

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37646.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37710.exe

Hebrew

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37647.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37712.exe

Hindi

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37649.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37713.exe

Hungarian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37651.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37715.exe

Italian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37653.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37717.exe

Japanese

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37654.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37718.exe

Korean

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37657.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37722.exe

Norwegian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37662.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37727.exe

Polish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37664.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37728.exe

Portuguese

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37665.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37730.exe

Russian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37669.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37733.exe

Slovenian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37673.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37738.exe

Spanish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37675.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37740.exe

Swedish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37677.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37741.exe

Thai

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37679.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37743.exe

Turkish

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37681.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37745.exe

Ukrainian

64bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37683.exe

32bit http://msft.digitalrivercontent.net/01/501016817-10234441–EUR//office2010/X16-37746.exe

ref：
1. http://www.mydigitallife.info/office-2010-language-packs-free-official-direct-download-links/

2. http://www.lxybld.com/forum.php?mod=viewthread&tid=877

3. http://blog.sina.com.cn/s/blog_7372c8cb0100r7gb.html