Lync Server 2010 empowers the Exchange 2010 Outlook Web Application (OWA) with presence and IM chat. Although Outlook users are familiar with presence, this integration enables Outlook Web App users the same functionality. Of course, users must be both mailbox enabled on Exchange 2010 and Lync enabled for Lync Server 2010 to use this cool new feature.
Here is how to enable the Lync Server functionality in Exchange 2010 OWA:
1. First download the following files from Microsoft.com:
CWAOWA Web Service Provider (previously known as the OCS 2007 R2 Web Service Provider), CWAOWASSPMAIN.msi
Hotfix for Lync Web Service provider found in KB 981256
Unified Communications Managed API (UCMA) hotfix found in KB 2282949 ...