Earlier quoted context omitted.
Probably. A lot of people really loved MSMAIL; not so much Exchange. I have more long, boring stories about projects there, but that’s for another day
And sometimes they loved MSMAIL for the weirdest reasons... MSMAIL was designed for Win3.x. Apps didn't have multiple threads. The MSMAIL client app that everyone used would create the email to be sent and store the email file on the system. An invisible app, the Mail Pump, would check for email to be sent and received during idle time (N.B. Other apps could create/send emails via APIs, so you couldn't have the email…
That is something that's actually pretty common and called "benevolent deception" - it has been discussed on HN some years past, too [1].