If you previously used Hotmail Plus, you'll automatically get Ad-free Outlook.com when you change over to Outlook.com.
For only $19.95 USD a year,
you'll see no graphical ads in your inbox with Ad-free Outlook.com.
You don't need to log in to keep your account active as long as your Ad-free Outlook.com subscription is current.
There are no graphical ads in Ad-free Outlook.com—all you see is your email, photos, and documents.