I once interviewed the manage who built MSN messenger - and when I asked her what the most important thing to the growth was, she said it needed to be able to punch through NATs so kids could use it at high school and uni, because that was the segment they were trying to get it to take off in. (and from what I recall, that strategy indeed worked quite well)
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... and filesharing, from the days when bittorrent was huuuuge.
I once interviewed the manage who built MSN messenger - and when I asked her what the most important thing to the growth was, she said it needed to be able to punch through NATs so kids could use it at high school and uni, because that was the segment they were trying to get it to take off in. (and from what I recall, that strategy indeed worked quite well)