I love dragging this out: http://blogs.technet.com/b/exchange/archive/2004/04/08/109626.aspx http://blogs.technet.com/b/exchange/archive/2004/04/08/10962... t

I love dragging this out: http://blogs.technet.com/b/exchange/archive/2004/04/08/109626.aspx http://blogs.technet.com/b/exchange/archive/2004/04/08/10962... tl;dr - Bedlam DL3, a famous "Me too" reply-all incident at Microsoft in 2004, on the order of 15 million total messages.