Microsoft Exchange Server 2010 SP1 Help

Microsoft updated the Microsoft Exchange Server 2010 SP1 Help file - December 2010.
You can get it here

Microsoft Lync Server 2010 Administration Guide

Microsoft released the Microsoft Lync Server 2010 Administration Guide - December 2010.
You can get it here

Microsoft Lync 2010 - Multilingual User Interface

Microsoft released the Microsoft Lync 2010 - Multilingual User Interface.
You can get it here: x32 or x64

Migrating from Office Communications Server 2007 to Lync Server 2010

Microsoft released the Migrating from Office Communications Server 2007 to Lync Server 2010 document - December 2010.
You can get it here

Microsoft Exchange Server 2010 Update Rollup 5

Microsoft released the Update Rollup 5 for Exchange Server 2010.
See description in KB2407113 and download from here

Update Rollup 2 for Exchange Server 2010 Service Pack 1

Microsoft has released Update Rollup 2 for Exchange Server 2010 Service Pack 1
See info about the update here and download from here

Microsoft Office Communications Server 2007 R2 Operations Guide

Microsoft released the Microsoft Office Communications Server 2007 R2 Operations Guide.
You can get it here

Microsoft Forefront Unified Access Gateway 2010 SP1

Microsoft has released Forefront Unified Access Gateway SP1
You can get it here

Publishing Outlook Web App and Exchange ActiveSync Using Certificate Based Authentication with Forefront TMG or Forefront UAG

Microsoft has released the Publishing Outlook Web App and Exchange ActiveSync Using Certificate Based Authentication with Forefront TMG or Forefront UAG document - December 2010
You can get i here

Microsoft Lync 2010 SDK

Microsoft released the Lync 2010 SDK
Download from here