Re: and I remember vaguely
Sendmail is also much more than an MTA.
Sendmail has had line-stopper issues occasionally; maybe a dozen times in the nearly four decades I've been running it. Microsoft has line-stopper issues weekly, if not daily.
The sendmail issues were fixed by patching sendmail, and then restarting it. No need for a server reboot or any other histrionics. No muss, no fuss.
I wonder how many man-hours are wasted every year due to Microsoft being incapable of writing secure code. Worse, how many man-hours (read "dollars") has your company wasted in the last year due to Microsoft's inability to write secure code?