Question about Outlook Express

I need help with this, I have cleared my browsing history and cache, and have attempted to login in via three different browsers (safari, chrome and firefox) and my cellphone (iphone 5) yet I have still not been able to access my account. This email account is very important to me, I have had it for nearly six years, I need to be able to access it. I have been unable to access it through live mail or outlook itself.