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Guide How to configure Lync 2010 and Lync 2013 Mobility coexistence


Currently I am working on Lync 2010 and Lync 2013 coexistence. I would like to phase users to new Lync 2013 server in a phased manner. My most of the users are depend on Lync mobile device for communication purpose. So I tried to configure Lync 2010 & Lync 2013 mobility coexistence but after spending three days no luck, even there is no document for the same.

Below is my setup,
Lync front End 2010
Lync Edge 2010
Lync 2010 Mobility
Lync Front End 2013
Lync 2013 Mobility
Microsoft TMG as Reverse proxy

* I have successfully configure Lync 2010 and Lync 2010 in coexistence state.
* I was able to make calls from Lync 2010 to Lync 2013 and vice versa.
* I was able to make calls from Lync mobile App to Lync client internally. (Just for Lync 2013)
* Configure TMG reverse proxy to send web services traffic to the Lync 2010 front end server.
* Also able to access dialin,meet,lyncweb URLs from Public internet.

But I was not able to sign in to Lync 2010 & Lync 2013 server at same from Lync mobile client. As auto discover URL was not able to resolve proper front end server & not able to return to the correct external web services FQDN.

To solve above issue,

1. Login to Lync 2013 Front End server & change Lync 2013 front end server web services URL to lync2013.vmwareandme.com & publish Lync topology.


2. Go to your certificate provider portal and generate new Lync public certificate which contains new Lync 2010 web services URL. Also add global DNS record for lyncweb2013.vmwareandme.com (e.g. lyncweb2013.vmwareandme.com -> 1.2.3.4). Point lyncweb2013.vmwareandme.com IP to the same IP address as the Lync 2010 web services IP address.

Now import newly generate SSL certificate in second step on Forefront TMG server. Import certificate in Local Computer ->Trusted Root Certification Authorities folder or Personal. Now keep the old Lync 2010 web services TMG rules as it is. Just add new proxy rule for Lync 2013 web services and point it to the Lync server 2013 front pool as shown below


Now you will be able to login to Lync 2010 as well as Lync 2013 server via Lync 2010 & Lync 2013 mobility App. When you login using lync 2010 user then lyncdiscover.vmwareandme.com traffic will be passed to Lync 2010 front end server. If user is identified as Lync 2013 then lyncdiscover.vmwareandme.com traffic will be passed to Lync 2013 front end server.