er... a few clarifications
I usually find Andrew's articles to be a good read - whether you agree or not they prompt debate - and wish more of them had comments enabled (good piece on Spotify vs music-buying, btw, although 0.6m from 35.2m is a decline of <2% yoy, so not necessarily much to talk about just yet).
However, on this one, it would appear things have gone a bit haywire.
" Did the whole world just migrate away from Hotmail over to Facebook when we weren't looking?"
er... no. Long term trends show that Hotmail unique figures have stayed at worst steady, at best have climbed slightly over the last 3 years, even while Facebook goes on the rampage.
"Microsoft dropped the email client from Windows 7, the rebranded version of Outlook it calls Windows Live Mail".
er... no. It was Outlook Express, and my guess is that it was either dropped as part of its efforts to appease everyone by unbundling software, or because there was no further development of it.
Interestingly, research from various sources suggests that it's IM that's been the big loser from TwitFace - even with Facebook's 'IM' client being absolute rubbish - while email retains a very different purpose and identity from the social networking sites.
Sooo.... interesting piece on email software, but the premise needs work.