How do I find out when a certain hotmail account got deleted and how can you retrieve old emails and chat history?

Hi I need to find out when a certain account got deleted but not sure how to find out rang Microsoft they told me to go on website and ask technical help but can't see It where I can contact them on website. Plus need to find out if I can retrieve old emails and chat history and how very important need to get all this info for my partners court case