Unified Communications Phones and Peripherals Datasheets

Microsoft released v042611 of the Unified Communications Phones and Peripherals Datasheets, you can get them here

Exchange Server 2010 Deployment Assistant v2.0.0.0

Microsoft updated the Exchange Server 2010 Deployment Assistant, check it out here

Integrating Microsoft Lync Server 2010 and Avaya Communications Manager S8300

Microsoft released the Integrating Microsoft Lync Server 2010 and Avaya Communications Manager S8300 document.
You can download from here

Microsoft Lync 2010: April 2011

Microsoft released Lync 2010, v4.0.7577.275
See description in KB2540951 and download from here x86 or x64

Updates for Microsoft Lync Server 2010, April 2011

Microsoft released an update for Microsoft Lync server 2010, v4.0.7577.139
See description in KB2493736 and download from here

Lync Server 2010 Support for SQL 2008 R2

The Lync Server product team says SQL Server 2008 R2 now is supported for Lync Server 2010.
See here

Lync Server Documentation: April 2011

Microsoft updated the Lync Server 2010 Documentation, check here
You can download the compiled version from here