Apps and Options to Attend Microsoft Lync Meetings External and Anonymously

Microsoft Certified Options:

PC via Lync Attendee:
http://www.microsoft.com/en-us/download/details.aspx?id=15755
Good blog on Attendee versus Lync Web App: http://blogs.catapultsystems.com/tharrington/archive/2010/11/08/lync-conferencing-client-comparisons.aspx

PC Via Lync Web App (SilverLight)
http://blogs.technet.com/b/lync/archive/2010/10/19/introducing-microsoft-lync-web-app.aspx

Mac via Lync Web App (SilverLight)
http://blogs.technet.com/b/lync/archive/2010/10/19/introducing-microsoft-lync-web-app.aspx

Uncertified Options:

iPad via XavyMeeting (2USD)
http://itunes.apple.com/us/app/xavymeeting/id527713571?mt=8
Review: http://windowspbx.blogspot.com/2012/06/first-impression-of-xavymeeting-lync.html

XavyMeeting for Android (1USD)
https://play.google.com/store/apps/details?id=com.damaka.ucc.XavyMeeting.ui&hl=en

You may also have interest in our Lync Mobility Solution Comparison Report:
http://windowspbx.blogspot.com/2012/06/microsoft-lync-mobility-solutions.html