A partir de 31 de outubro de 2018, o Microsoft Office 365 não terá mais suporte para TLS 1.0 e 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