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O365 makes sense if it's down all day, since this is a leap year, after all.

The exact-ish length of a year is 365.2422 days. 365 days a year is three nines of uptime (99.93369%).

They didn't call it O365/24/7 for a reason.

1990s hosting company: Linux Server 99.99% uptime. Windows - no guarantee. 2020 - same

In 10 years it'll be Office 404

Edit: maybe not that short, in 20, 30 years maybe?

39 is my guess. 365+39=404