Exchange 2010 ActiveSync error with the latest Exchange iApp template

First, you should add a wildcard to the URI that we're checking for ActiveSync:

"/microsoft-server-activesync*" {

The purpose of the last section is to disable OneConnect if a Negotiate header is seen, because the proper OC/NTLM behavior is triggered by seeing the NTLM header first. Shouldn't have anything to do with ActiveSync, which uses Basic auth.

Are you seeing the same issue where the POST request does not include the Basic auth header?