Here is the update list for the Skype for Business on Mac:
Download the latest update for Skype for Business on Mac
| Version | Release Date |
|---|---|
| 16.6.0.333 | May 2, 2017 |
| 16.5.0.185 | Mar. 28, 2017 |
| 16.3.0.240 | Feb. 6, 2017 |
| 16.2.0.145 | Dec. 12, 2016 |
| 16.1.0.456 | Nov. 23, 2016 |
| 16.0.0.3638 | Oct. 27, 2016 (RTM) |
Please also check the Known issues – Skype for Business on Mac.