Just about a week ago I posted news that the appX file for Skype UWP on Windows 10 Mobile was leaked over on XDA. While the version is not yet complete nor officially even in public beta testing you can sideload the app onto your phone running the latest Slow, or Fast Ring Insider build e.g. 'Redstone'.
Recently, XDA mod snicker, who managed to get his hands on the leaked app updated the post with a more recent version. The latest build is 11.6.36, which is a jump from last week's 11.6.26.
Voice and video calls reportedly now work with this release although notifications are still out of the picture for now. While the app performance is fantastic relying on what is essentially an alpha build of Skype for work may not be a very good idea so heed caution.
Thanks, Kyle S., for the tip!