Infrastructure requirements for Skype for Business on Mac These clients are not supported by Skype for Business Server 2019.
Microsoft Communicator for Mac 2011 (see Communicator for Mac 2011 Deployment Guide) Microsoft Lync for Mac 2011 (see Lync for Mac 2011 Deployment Guide) For details about supported features, see Desktop client feature comparison for Skype for Business. Skype for Business Server 2015 also supports the following legacy clients on computers that are running Mac OS 10.5.8 or latest service pack or release (Intel-based) operating systems (Mac OS 10.9 operating system is not currently supported). Refer to the System requirements for the minimum hardware required. This list is preliminary and some devices may be qualified for Lync, but not supported on Skype for Business on the Mac.
