Nice article, good to see some work still happening to support those EWS applications out there ...
I guess the one question that many people will ask off the back of this announcement and the comment of "This is also a good time to remind everyone that we are retiring Basic Authentication in Exchange Online" is when will Basic Auth be retired?
Second half of 2021 is what, July 1st ... do we expect people to plan for that date. or is there without sharing a date a minimum additonal 'notice' period people can expect for retirement. will we get at least 6 month notice as example.
Although while saying that i totally get that it was announced in ~2017 and customers / vendors should have or be moving away from it already, i'm still speaking to vendors now who only found out because we asked the question of them.
Anywho, love your work ! stay safe & take care !