Spellchecking in Your Language

Each of these spellchecking facilities (auto-correction, and word identification with corrective action menus), use the spellchecking dictionaries installed on your local PC. In the Windows Developer Preview, all of the dictionaries for all the supported languages are pre-installed. Many of the languages also include different language reform variants that you can toggle between in the re-designed Language control panel. All spellchecking options can be managed in the language control panel in Windows 8. On Windows 7, the spellchecking management experience for IE10 will be provided by the browser instead; I'll describe this in more detail in a future post.

The Windows 8 language options dialog for Portuguese (Brazil), including language reform variants

Internet Explorer 10 supports spellchecking in many common languages. View a list of supported spellchecking dictionaries and language/locales, including language reform variants.
There are sometimes needs for highly specialized spellchecking dictionaries, for example, in specific industries with their own vernacular or for languages not commonly spoken such as Latin. To support these scenarios, the Windows 8 spellchecking facility supports 3rd party spellchecking engines. When installed, IE10 and all other Windows components will use the installed 3rd party spellchecking engine.