Microsoft SharePoint 2010 makes it easier for people to work together.
Using SharePoint 2010, your people can set up Web sites to share information with others, manage documents from start to finish, and publish reports to help everyone make better decisions.
via What is SharePoint? | SharePoint Capabilities and Features.
Dynamic disks were first introduced with Windows 2000 and provide features that basic disks do not, such as the ability to create volumes that span multiple disks spanned and striped volumes, and the ability to create fault tolerant volumes mirrored and RAID-5 volumes.
Dynamic disks offer greater flexibility for volume management because they use a database to track information about dynamic volumes on the disk and about other dynamic disks in the computer. Because each dynamic disk in a computer stores a replica of the dynamic disk database, Windows Server 2003 can repair a corrupted database on one dynamic disk by using the database on another dynamic disk.
via What Are Dynamic Disks and Volumes?: Storage Services.
I am unsure as to why this is done at the OS level.
Microsoft® Lync® is an enterprise-ready unified communications platform. With Lync, users can keep track of their contacts’ availability; send an IM; start or join an audio, video, or web conference; or make a phone call—all through a consistent, familiar interface. Lync is built to fully integrate with Microsoft Office. The Microsoft Lync 2010 desktop client is available for Windows and for Mac and mobile versions are available for Windows Phone, iPhone/iPad, and Android devices.
Via The Next Generation of Unified Communications – Microsoft Lync.