wife and I have linked account, but wife is not computer savy, can access my account but not hers in the new outlook

Every day check her email and mine in out look, linked account, but when they changed the other day, I can access my account but not hers. What happened to the linking? Why is it not available. If it is how do you set it up like when it was in hot mail. I have no way of going back to hot mail, but outlook should provide an avenue for linking. If outlook is new why is there know features like this, if it is so modern.