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.."