Exchange 2013 and TLS 1.1/1,2
I have engaged Microsoft regarding this issue. Here is their response:
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