Eu me envolvi com a Microsoft em relação a esse problema. Aqui está a resposta deles:
Disabling TLS 1.0 on Exchange is unsupported. Solution is to keep TLS 1.0 enabled on Exchange Server.
An article will be released publicly at the earliest. Kindly update your client accordingly and feel free to reply back with queries.
Regards, Ramakrishnan M Microsoft Exchange Client Server Interface