It's very confusing when people say Outlook as there is more than 9ne email system that uses this name. I forcexam0le have 2, Microsoft Outlook which is free and uses @hotmail as part of my address and then I also have MS office package that you pay for and the email client that comes with that is also called MS Outlook but those emails have my address as the one my ISP gave me.
Only saying this as the way they look is completely different to each other including all the function buttons, where they are, appearance, how to do things etc.