We talked about the Tatar Language Interface Pack (LIP) for Office 2007 a few weeks ago. Since then, other LIPs for Office 2007 have been released. LIPs enable users to work in a localized environment and traditionally include a spell-checker for that language. So if you are looking for spellers for Basque (700,000 speakers), Galician (3 million speakers), Malay (7 million speakers), or Bengali (released last week, 230 million speakers), or if you want to see your UI in one of these languages, check out the Microsoft Local Language Program web site or click on the name of the language in this sentence to freely download the corresponding LIP with its speller.

Source- MSDN Blog