Microsoft Lync is a next-generation communications service that connects people in new ways, anytime, from virtually anywhere.
With Lync, you can:
Keep track of your contacts’ availability
Send instant messages
Make phone calls
Start or join audio, video, or web conferences
Lync is built to fully integrate with Microsoft Office. You can download the Microsoft Lync 2010 mobile version to your phone from Store.
For more info, see the user documentation on the Microsoft Lync support pages at http://lync.microsoft.com/en-us/resources/pages/resources.aspx?title=downloads.
See also the Office section in this user guide.