Posted February 26, 2010

Live is horrible when it comes to regions. The language shown to you will differ depending on the game or whether you're using the standalone client. IIRC, the client (which I haven't used for a while) will display information according to the language of the region you set, but buttons and menus are based on the language of your OS.
Games however, will either display in English or Japanese and I still haven't worked out exactly how it decides. For example, FUEL displays in English, whereas Red faction: Guerrilla will display everything in Japanese. I use a live account with the location set to the UK for playing games just in case I ever return to the UK for an extended period.
I also have a Japanese account, but no games registered to it.