My Hotmail folders and emails disappeared, New Emails Not Arriving and Not Clear how to Contact Customer Support

I use my Hotmail email account for all the work I do from home. Recently all my folders along with my emails disappeared along with emails that are to be provided as evidence in a court case. Furthermore I am not receiving new emails e.g. purchase confirmation from Amazon, friends, receipts sent from purchases and Trade Me. Please advise who can assist me with this. This is extremely urgent. I am an older user and am not confident in using computers. Also Hotmail does not appear in the drop down list below.