Microsoft has released a trial version of Lync Server 2010
Microsoft Lync Server 2010 provides complete presence, instant messaging, conferencing and enterprise voice capabilities through a single, easy-to-use interface. You can Architect your deployment for high availability using data center resiliency and survivable branch appliances. Administrators benefit from a single, consistent management infrastructure, new capabilities to increase availability, and interoperability with existing systems. Administrators also use a new PowerShell-based foundation for administration consistent with Exchange Server, Active Directory, and other Microsoft server products.Lync Server 2010 Trial
This Microsoft Lync Server 2010 Trial includes both editions of the server (Enterprise Edition and Standard Edition).
