Hello, I bought a new computer, I use outlook with a subscription to office 365. In outlook I had 2 email addresses 1) xxxx@9online and 2) email@example.com . Now I want to use firstname.lastname@example.org but when installing, it's xxxx@9online that taken by office 365 and impossible to add email@example.com. How do I replace firstname.lastname@example.org with email@example.com when installing or just after? Thank you so much for your help.