[Aardwolf]

I've been out of the loop due to using Linux the last 20 years, but back when I was using Windows XP, the default mail client was also called Outlook (well, Outlook Express).

So apparently I missed some time period where it was called "Mail" instead. But now it'll be Outlook again. Full circle!

[pmontra]

Full circle twice: there was a Microsoft Mail well before Microsoft Outlook https://en.wikipedia.org/wiki/Microsoft_Mail