I'm a freelancer software developer and after almost six months I was able to use outlook.com and live domains in my client. But in the beginning I used my personal outlook email to set up the domains under live domains, now I created a new outlook account and I need to migrate everything from my personal email to this new email account without loose everything I worked so far, my customer have 18 emails and two domains working.

Is it possible to replace my personal email account by this account I created to my customer? without loose everything I did so far?