For awhile I ran a really large email system for an enterprise with lots of different lines of business -- right after the change in Federal rules of civil procedure that made email the best place to hunt for evidence in litigation. At the same time, we were working with archivists on some of the issues around preserving documents -- the ODF vs Microsoft format thing was a hot item at the time.

That really opened my eyes to the often ignored downsides of electronic media. In the US, we have constitutional protections around our "papers" in our homes, but third party doctrine dramatically weakens the protections around all sorts of things.