ExternalUrl for EWS for Lync Mobile App w/ Exchange 2010

Greetings- I have a Standard deployment: 1 FE, 1 Edge, 1 Reverse Proxy. Mobile App users can log in, but cannot access contacts/calendar info from Exchange Server. Checking Configuration Information on Lync Desktop client shows "EWS Not Deployed".
I've been piecing together articles on "how-to" but they are for Exchange 2013.
One article says that part of the process is to run the script Configure-EnterprisePartnerApplication.ps1. This is not present on my Exchange server.
Another step is to configure the external WebServicesVirtualDirectory using the cmdlet
Set-WebServicesVirtualDirectory -Identity Contoso\EWS -ExternalUrl https://www.contoso.com/EWS/Exchange.asmx
When I do this, I get an error "The operation could not be performed because object '[mailserver].local\EWS' could not be found on 'DNS_Server.local'
Hmmm....

Correct, I would imagine ExternalURL would only be external. If you didn't have EWS published you would be only leveraging the internal URL.
The other thing is if your DNS auto-configure is configured for your email system LYNC should be leveraging the DNS records to connect. So, if you have outlook essentially doing outlook-anywhere today with auto finding its settings via e-mail lookup those
things should work.
If you had DNS configured to go off DNS SRV records you would only have to do this.
Note:
The AutodiscoverVirtualDirectoy URL are supposed for Microsoft's optional use only.
Therefore it is not necessary and not Best-Practise defining them!
If you set the URL's, it will NOT HAVE AN IMPACT. Meaning, if they are defined or not, it will not change the Autodiscover behavior, since they are NOT USED within Exchange.
What is IMPORTANT, is the Authentication, you must set it the Basic Authentication, so the SSL configuration will take part.
It would be enough is you configure simply:
Set-AutodiscoverVirtualDirectory -Identity 'autodiscover (default Web site)' -BasicAuthentication $true
I can agree with autodiscover rules making the EWS be found. That has worked for me in my previous environments.

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