If you use Outlook.com as your primary email address, you should know that you can change the default language from English to your language (if its supported). The good thing about Microsoft’s services, including Outlook.com is that it does a good job of supporting multiple languages.

Log in to your Outlook.com account, click on Settings (wheel icon) and go to More Mail Settings. 

Under Customizing Outlook section, click on Language.

It will show you all of the supported languages. Just scroll down and see if it supports your native language. If it does, simply check it and click Save.

It will change Outlook layout and will translate it in your desired language.

[Via]