>I was just wondering, what happens for users who are away, say, 2-3 months. Won't they still get too many messages when they expand a category?

The 30 days, as before, is still in effect. If we talk about 35,000 messages, for example, we have to fix a limit. IAC, going too far is useless. If someone would like to get last year messages, they can use any existing tools, such as calendar, for such purposes, so it was the case before.