Login button when you log out and log
To use Mail with other service using your Microsoft account sign Microsoft.
To understand more about why you should sign in, here I say quick simple steps:
1.Click the Start button Picture of the Start button to open the Windows Live Mail. Mail typed in the search bar, it will the approved list, results, then click Windows Live Mail.
2.Click Login on the Home tab.
3.Fill out your account information, such as name and password. For remember me if you want to always sign in with this account, and then click OK.
See more: How to create a Hotmail account