Skype 7.21.0.100 for Windows desktop is out, no changelog yet
— Roman (@rlinev) March 10, 2016
If you are a regular user of Skype for Windows, the update can be downloaded by checking out the Help section in the Titlebar, before you move on to Check for Updates so that the latest build can be downloaded. Of course, there are also other more direct methods, such as a direct link on which you can click here.
It is always best to make a quick backup of your existing Skype contacts somewhere before performing software update, just in case Murphy decides to strike with that irritating Law. One cannot help but wonder whether this update has anything to do with the recently announced Project Rigel or OneDrive integration.