accessing outlook after reinstalling office without the old email password

I recently reinstalled office 2010 on a computer that was wiped clean and then had win 10 installed. Once I reinstalled office, I went to outlook 2010 to open it and have access to my old emails again. However, I was required to use my old password to access outlook. I do not have that password, so I can't open my old outlook emails. What should I do now?