Integrating Lync 2013 into Exchange 2010

I'm attempting to integrate Lync 2013 into Exchange 2010 however experiencing difficulties.

I followed the how to article at:
http://blog.schertz.name/2010/11/lync-and-exchange-im-integration/

I have it setup however when I browse to the Outlook Web App interface, I get the following error:
Instant Messaging isn't available right now. The Contact List will appear when the service becomes available

I looked in the event log for both the exchange server as well as Lync but there were no errors that have appeared.

What's the best method of diganosing communication failures between Exchange and Lync?
Adeste1Asked:
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Adeste1Author Commented:
I tried following that article previously with the same outcome.

This may be a foolish question but, do I need to install Exchange Unified Messaging Role on the Exchange Server?
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AmitIT ArchitectCommented:
Did you completed Step 3-4 or not?
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Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

Adeste1Author Commented:
Yes I have completed those steps.
Installed-Apps.png
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Adeste1Author Commented:
After a week straight of working on this, I have finally been able to figure it out.

I used the external domain name (mail.domain.com) rather then the internal FQDN (nt-exchange01.domain.local) and it started working immediately.

Thanks
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Adeste1Author Commented:
Found the issue
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