To resolve this issue, the Lync admin should use the Invoke-CsUcsRollback cmdlet to roll the user back from Unified Contact Store (UCS) mode. When you try to edit your contacts in Lync 2010 or Lync for Mac 2011, you receive one of the following error messages: Solution Microsoft Lync 2010 (64-Bit) provides a single interface that unites voice communications, IM, and audio, video, and Web conferencing into a richer, more contextual offering. Download the latest version of Lync for your computer. In the web mail interface, click the Settings menu (Gear icon) at the top right and choose “Office 365 Settings,” (see image, right) and then click 'Software'. To download Lync (2010 or 2013 for Windows, 2011 for Mac), sign in to your web mail (). It’s targeted at filling the holes where an organisation may have a team of creative/alternative users on Macs that need a client other than Lync Web App to.
In conclusion, Communicator for Mac 2011 is essentially a “there is a Mac client” answer for Microsoft Lync, ported from another application.
