What is Cronofy doing about the upcoming changes to Exchange Web Services (EWS) API for Office 365?

Microsoft have announced that they are removing Basic authentication access support for EWS in the second half of 2021 (originally planned for October 13, 2020): Upcoming Changes to Exchange Web Services EWS API for Office 365

Similarly to how we dealt with Apple changing to required app-specific passwords in 2017, we will make this transition as seamless as possible.

We now use Modern authentication for all new connections to Office 365 by default (Individual Connect has done this for years, Enterprise Connect supported this as of January 2020). Existing connections using Basic authentication will continue to function.

We will be reaching out with more details about the migration of Enterprise Connect connections to Office 365 in the first half of 2020, to give those affected several months to replace their Basic Auth connections with Modern Auth connections to retain a seamless service.

We will also remove the ability to use Basic authentication at all to prevent anyone going back to Basic authentication around this time.

With Apple we sent out multiple rounds of notifications to people affected by the change, and we will do similar for this situation.