Your Microsoft account is an account you created that store all your Microsoft stuff. Things associated with MS like wallpapers and web browser favorites. You can use any email address to login to your Windows account. Since you used your Google email address you have a password you created when you created that google account. That username and PW are used when you access Google things like, Chrome favorites or Youtube. If you use that email to login into your Windows account it uses whatever password you created when you created that Windows account. Your computer information is also stored on the MS server in your account. You can use your MS Account to login to live.com (outlook .live.com) but you don't have to.