MSFT ha liberado algunas actualizaciones para Lync 2010, aquí os dejo los enlaces de descarga:

Lync 2010 Attendee Hotfix KB 2815354 (Admin level install)
This download includes all available updates for Lync 2010 Attendee.

Microsoft Lync 2010 Attendee – Admin Level Install
Microsoft Lync 2010 Attendee is a conferencing client that allows users without Microsoft Lync 2010 installed, to participate in online meetings…administrator account on the computer can install Lync 2010 Attendee so that users of the computer…

Lync 2010 Hotfix KB 2815347 (32 bit)
This download includes all available updates for Lync 2010.

Lync 2010 Hotfix KB 2815347 (64 bit)
This download includes all available updates for Lync 2010.

Microsoft Lync 2010 Attendee – User Level Install
Microsoft Lync 2010 Attendee is a conferencing client that allows users without Microsoft Lync 2010 installed, to participate in online meetings. If you are not an administrator…

Lync 2010 Attendee Hotfix KB 2815352 (User level install)
This download includes all available updates for Lync 2010 Attendee.

Ahora toca actualizar!!!!