Re: The Wheel of History
I've used Notes (casually, and largely as a tech doing installs and troubleshooting). I've used Groupwise back during the Netware 4.x / 5.0 days. I've used Outlook in all it's forms; We'll leave Outlook Express (later renamed to simple "Mail" for win10) out of this discussion.
They all that their good points, and at some level, they all suck various amounts of goat urine.
While I've never used the back-end of Notes and Groupwise, I imagine they are on the same level as Exchange.
I've yet to work with any application that does what those products do nearly as well and with that level of integration.