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Hi, experts!<br />
<br />
I try to integrate IM between Exchange Server 2010 OWA and Skype for Business Server 2015. The configuration was performed by the following article - <a href="http://blog.schertz.name/2010/11/lync-and-exchange-im-integration/" rel="ugc">http://blog.schertz.name/2010/11/lync-and-exchange-im-integration/</a>&nbsp;<br />
All the stages of the configuration pass without errors. But when I login to OWA I see that instant messaging does not work, IM icons are disabled and I see the following error:<br />
<br />
&quot;Instant Messaging isn’t available right now. The Contact List will appear when the service becomes available..&quot;
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Hi, experts!

I try to integrate IM between Exchange Server 2010 OWA and Skype for Business Server 2015. The configuration was performed by the following article - http://blog.schertz.name/2010/11/lync-and-exchange-im-integration/ 
All the stages of the configuration pass without errors. But when I login to OWA I see that instant messaging does not work, IM icons are disabled and I see the following error:

"Instant Messaging isn’t available right now. The Contact List will appear when the service becomes available.."

Integration error: Instant Messaging isn’t available right now...

Instant messaging (IM) is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat. Non-IM types of chat include multicast transmission, usually referred to as "chat rooms". Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the communication device).

Chat / IM

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Skype is for doing things together, whenever you’re apart. Skype’s text, voice and video make it simple to share experiences with the people that matter to you, wherever they are.

With Skype, you can share a story, celebrate a birthday, learn a language, hold a meeting, work with colleagues – just about anything you need to do together every day. You can use Skype on whatever works best for you - on your phone or computer or a TV with Skype on it. It is free to start using Skype - to speak, see and instant message other people on Skype for example.