À partir du 31 octobre 2018, Microsoft Office 365 ne prendra plus en charge TLS 1.0 et 1.1

[fefrei (Felix Freiberger)]

Just as a reference of what others are doing, GitHub (which admittedly has an audience that is rather likely to keep browsers up to date) is disabling TLS 1.0 and 1.1 now:

Weak cryptographic standards removal notice