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Re:A bit of XENIX history (2014) by gerikson on Thursday April 08, 2021 @01:24AM (#26735358)
I seem to remember reading that Microsoft used Xenix internally for stuff like email.
Re:A bit of XENIX history (2014) by ggm on Thursday April 08, 2021 @01:27AM (#26735371)
You'd think the whole Office uplift, "mail is now in MS-SQL" thing did for that. The transition over must have been amazing.

I wonder who the last holdouts were, for a sendmail.cf world.

(there was a port to Windows, maybe they uplifted sendmail as-is?)