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Windows 7 fully translated Language Packs are limited to major languages: Dutch, English, French, German, Italian, Japanese and Spanish. Windows 7 MUIs / LPs are available for both 32-bit and 64 Windows 7 operating systems.
Windows 7 partially translated Language Packs are available for the Microsoft - important languages Arabic, Bulgarian, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish as well as Ukrainian.
Windows 7 partially translated Language Packs are limited to the base language(s) a user is most likely to understand; detailed information can be found in our article How to install a Windows 7 Language Interface Pack. Windows 7 partially translated LPs are available for both 32-bit and 64 Windows 7 operating system.
LIPs on the other hand are x86 only! and furthermore limited to the “non-major” languages Afrikaans, Albanian, Amharic, Armenian, Assamese, Azeri, Basque, Bengali ,Bosnian, Catalan, Filipino, Galician, Georgian, Gujarati, Hausa, Hindi, Icelandic, Igbo, Indonesian, Inuktitut, isiXhosa, isiZulu, Kannada, Kazakh, Khmer, Kiswahili, Konkani, Kyrgyz, Lao, Luxembourgish, Macedonian, Malay, Malayalam, Maltese, Maori, Marathi, Nepali, Norwegian, Oriya, Persian, Punjabi Quechua, Serbian, Sesotho, Setswana, Sinhala,Tamil, Tatar, Telugu, Urdu, Uzbek, Vietnamese, Welsh and Yoruba.
Please check out Bright Hub’s articles How to install a Windows 7 Language Pack and How to install a Windows 7 Language Interface Pack. There you will learn all you want to know about Windows 7 Language Packs installation, including how to change the display language.
Availability of Windows 7 Language Packs and LIPs:
Users of Windows 7 Ultimate can obtain fully and partially localized Language Packs through Windows Update, in optional components. Corporate administrators of Windows 7 Enterprise can obtain the MUIs trough the Microsoft Partner Network.
To find out which Windows 7 LIPs are planned and which Windows 7 Language Interface Packs have already been released please see our How to install a Windows 7 Language Pack article.
BTW: In Microsoft terminology, both fully translated Language Packs as well as partially translated Language Packs are known as Complete Language Packs .
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 Microsoft: http://msdn.microsoft.com/en-us/goglobal/ee461121.aspx
Understanding Windows 7 Language Packs: Details & Availability
This series really covers everything you need to know for successful deployment of Windows 7 Language Packs and Windows 7 Language Interface Packs.