Microsoft Lync 2010

From Microsoft:

Microsoft Lync 2010 provides a single interface that unites voice communications, IM, and audio, video, and Web conferencing into a richer, more contextual offering. It contacts enhancements that make it easier to find people and keep track of your contacts. It has expanded sharing and collaboration features, including application sharing, whiteboard, and annotation tools, polling, and PowerPoint presentations. It offers recording and playback for meetings, improved meeting join experience, and call quality checks and diagnostics.