Not sure where I came across this the first time, but it is an
interesting take on what collaboration in the enterprise will could look
like in the future from Scott Gavin although something tells me that email will still be a part of the equation as will other messaging formats (IM, text, etc.)

https://s3.amazonaws.com:443/slideshare/ssplayer.swf?id=42907&doc=meet-charlie-what-is-enterprise20-29751