Prevent/Fix: Your organization is still using TLS1.0 or TLS1.1 to connect to Exchange Online
TLS1.0 and TLS1.1 are in the process of being deprecated in Office 365. All clients connecting to Office 365 need to use TLS1.2. As announced by Microsoft previously, TLS1.0 and TLS1.1 are no longer supported in Office 365 as of October 2018. Customers should no longer be using TLS1.0 and TLS1.1 to connect to Exchange
