For some time now, all emails and text messages from Microsoft are written in Russian. Due to my young son now using the internet, and occasional emails are received with regard to his usage, I now need to rectify the issue, so that I understand what he has been doing. 

All of the pages are in English on the accessed microsoft websites via my username etc, so it really doesn't make sense why they would send me messages in Russian.

How do I change this? I have already change default language from English (United States) to English (United Kingdom), there was no sign of Russian having been set previously.