outlook.com deletes my inbox without my permission

whenever i log in to my outlook account the only thing in my inbox is one weeks worth of email. anything before that is gone. i have not deleted them. they are not in the deleted folder. they are gone. i have tried the retrieval option and only about a month's worth is recovered but anything before that is gone. i used to be able to store important emails in my hotmail account but now that it is outlook, everything is gone. How can i get them back? How can i stop this from happening. Tech Support, please respond ASAP. Thank you.