Lost and Deleted Emails

I use my outlook account once in a while, but have definitely been on within the last 270 days. When the switch occurred from hotmail to outlook, all of my msgs were deleted. I tried to recover them via "recover deleted files" at the bottom of the delete tab in my email, and nothing was recovered. I am very frustrated that during a switch I did not allow all my email were wiped. 

Please offer a suggestion if possible as to how i can revert to hotmail or retrieve my emails that were wiped without my consent. 

Thanks!