Recovering my old email box

Hello,
Thanks for this opportunity to reach you on this subject matter. i have been having issues with accessing my email box for a very long time now (***@***). All efforts to open this box has been futile i opened this box between year 2000/2002 and many of my vital information still goes in there even my payslip in the office. have even tried to change the email address but some of my very vital mails still goes in there till date. i now have ***@*** as my new email pls i still like to access the old email help me.
Ayoola