I cut my teeth on Lotus Notes straight out of school. It was way ahead of its time and anyone who knows about Ray Ozzie knows that dude puts out good kit. Bill Gates didn't make him CTO for nothing.

Anyone who reduced it to a email client didn't understand where its true powered lied which was workflow and document / record management. If you knew how to combine the ACL with forms, views, and agents you could build some pretty amazing apps really quickly. Unfortunately it was always known as a email client which was actually just a Lotus Notes App.