Although I do not know why it is successful but you are right; mail is definitely not the reason why it is popular. But I don&#x27;t think it is for the reasons you think it is popular either. Of all my 25-early 40 year old friends working in enterprises, exactly 0 people like it and they avoid it like the plague when they can. They like it slightly more than Sharepoint, but that&#x27;s not saying much. To why it is popular still I would wager that&#x27;s because enterprises just &#x27;have it&#x27; and you have no other choice; you are forced to use it. But you were probably going to say &#x27;collaboration&#x27; ?