Microsoft this week released its free Lync 2010 mobile client for Windows Phone 7.x, providing access to the Lync server or service's presence, instant messaging, audio conferencing, and calling features while on the go. Lync 2010 for Windows Phone requires an on premise Lync Server in your company's computing infrastructure or Office 365, which provides cloud-based access to Lync Online.

Lync 2010 for Windows Phone was first announced early this year, and as I wrote in What I've Learned (So Far) At TechEd 2011 during this year's show, the company promised to deliver the client after the release of Windows Phone 7.5 and before the end of the year. Microsoft also makes Lync clients for Windows and the Mac, and had made various mobile clients for Lync's predecessor, Office Communications Server. Microsoft recently celebrated Lync 2010's first anniversary, as the server product was completed in December 2010.

Unlike other messaging options in Windows Phone, Lync is a standalone app and not integrated in any way with the underlying OS. However, thanks to the new background processing features in Windows Phone 7.5, users of that version of the mobile platform should experience more seamless connectivity, even when the client isn't available as the foreground app.

According to Microsoft, Lync 2010 provides the following key features:

View colleagues' availability in real time and select the best way to communicate – initiating an instant message (IM), email, or a phone call.

Connect to Lync conference calls with a single touch, without requiring long numeric passcodes or conference numbers. 

Make and receive calls using your Enterprise Voice (Lync ID) number only, so you can connect with others using a single, consistent identity.

Lync 2010 for Windows Phone provides transport layer security (TLS) and perimeter/internal network protection without requiring a VPN, so your communications experience is safer no matter where you are or what network you use.

Microsoft also provided the following sample screenshots.

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Lync 2010 for Windows Phone is available now from the Windows Phone Marketplace.