Nobody uses it anymore because the emails get flagged as spam when they are delivered the mail merge to email system is flawed users can't unsubscribe which means you fall foul of the spam laws in most countries.
The best way to use microsoft out look for emails is to set up an auroresponder account like awber and list your email address with them then as you get subscribers they will notify you - Your email is now regonized by thoose subscribes and it will not go to the junk pile