Microsoft Office 2010 Language Interface Packs are now available in 3 Nigerian languages, covering over 60 million speakers.

You can install them from here:

A Language Interface Pack allows you to change the user interface in the following Office 2010 applications: Excel, OneNote, InfoPath, Outlook, PowerPoint and Word. The pack includes a spell checker and is available for both 32-bit and 64-bit systems.

All three languages are already available for Windows 7 and Internet Explorer 9:

A few facts about these languages:

  • Hausa: 24 million native speakers, 15 million as a second language. Non-native pronunciation of Hausa differs vastly from native pronunciation by way of key omissions of implosive and ejective consonants present in native Hausa dialects. This creates confusion among non-native and native Hausa speakers, because non-native Hausa speakers do not differentiate between the pronunciation of words like daidai (correct) and ɗaiɗai (one-by-one) in non-native Hausa.
  • Igbo: 18 million speakers. Many names in Igbo are actually fusions of older original words and phrases. For example, one Igbo word for vegetable leaves is akwükwö nri, which literally means "leaves for eating" or "vegetables". Green leaves are called akwükwö ndu, because ndu means "life".
  • Yoruba: 20 million native speakers, 2 million as a second language. In Yoruba there are no differences between the singular and plural. The context decides whether a word denotes singular or plural.

For more information on these 3 languages, check the Wikipedia page on Nigerian languages.

Language Distribution in Nigeria (source: Wikipedia):