Try Microsoft Lync for free

There are two ways to try Microsoft® Lync® before you buy. You can either download a 180-trial version of Lync Server 2010, or you can try Office 365, which includes Lync Online, for 30 days.

Get at https://lync.microsoft.com/en-us/get-lync/Pages/try-lync.aspx

Read my favorites blogs:

Designing a backup less Exchange 2010 Architecture

Step by step guide for upgrading Active Directory from Microsoft Windows 2003 to Microsoft Windows Server 2008

Microsoft Exchange 2010 CAS Array – Steps and Recommendations

Appear Offline in Microsoft Office Communicator Server 2007

Microsoft Exchange 2010 Test cases

Microsoft Exchange Server 2010 Disaster Recovery