McAfee Enterprise can't provide advice about how to configure Exchange Autodiscover. You must contact Microsoft Technical Support for assistance to identify the cause of the excessive wait time consumed by Microsoft MSO.DLL. McAfee Enterprise recommends that you obtain a Windows Performance Recorder Trace of the node to verify that the issue is related to wait time being consumed by Microsoft MSO.DLL. If it does not, contact McAfee Enterprise Support using the details provided in the Related Information section below.

To learn more about Autodiscover provisioning, see https://msdn.microsoft.com/en-us/library/office/jj900169%28v=exchg.150%29.aspx or contact Microsoft Support.