If I switch to Hotmail Plus from Hotmail, will I lose the e-mail currently in my Hotmail account?

I am having problems with my regular Hotmail account.  So I am considering upgrading to Hotmail Plus because I don't like Outlook and because right now I am going to school online and they don't want me to change my e-mail address in the middle of the year.  But I want to make sure that if I upgrade, I won't lose all the saved e-mails in folders, and the e-mail I have opened and not deleted.  So, I need to get my question answered and when I call support, no one seems to be able to answer my simple question.  All they want to do is access my computer, and I am not ready to allow that yet.  Thank you for your help.