Here’s a breakdown of the differences between Lync basic and full client:
Lync 2013 Basic is a downloadable client for customers who have a licensed, on-premises Lync Server 2013 deployment and customers who subscribe to a Microsoft Office 365 plan that does not include the full Lync 2013 client. The Lync Basic client includes enhanced presence, contacts, instant messaging (IM), Lync meetings, and basic voice functionality.
Features not supported in Lync Basic include multiparty video, OneNote integration, virtual desktop infrastructure (VDI) support, skill search, recording, Enterprise Voice features, and advanced call handling (for example, call forwarding and Team Call). For details, see Client Comparison Tables.
http://technet.microsoft.com/en-us/library/gg398996.aspx
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