Offering different zipfiles for months/years wouldn't solve the problem. "The problem" is that when you have hundreds of millions of users, the easiest mechani

Offering different zipfiles for months/years wouldn't solve the problem. "The problem" is that when you have hundreds of millions of users, the easiest mechanism needs to be an efficient mechanism. Adding links for months/years would still leave the easiest mechanism as the least efficient: I know that I, personally, would continue to download the "all mail" zipfile just to ensure that I didn't miss anything. I cannot imagine my mother or grandmother doing anything different.