May I remind you that the English Language has many different varieties but Microsoft, being based in the USA, onloy ever use the US version which differs in many respects (especially spelling, grammar and pronunciation) to that used in the UK.
That Microsoft forces the installation of US English spell checkers and dictionaries is a key source of annoyance as the way things are expressed in the UK, for example, is very different to the way letters, etc are structured in the US.