Most of us in the Lync community have been waiting for this for sometime now. The wait is over: Skype to Lync video is now available!
For this to work, the Skype user needs to be on the latest Skype for Windows client (18.104.22.168). When I tried updating the Skype client directly from the client itself, it didn’t update me to v7. I ended up going here to get the latest version.
Once installed, I was able to get calls between my Lync 2013 client and the Skype for Windows client:
If the Skype client isn’t in focus, you also get a handy video only view that floats above your other apps: