I use (as an end-user) Lync 2013 with a Lync 2013 Server infrastructure.
A recent Windows update brought Skype for Business as a replacement/alternative for the Lync 2013 client front-end. I installed it and upon launching it informed me that the Lync administrators have enforced the use of Lync as a front-end and the installation program kindly asked me to restart the client to have Lync, instead of Skype for Business. However
- I had the option to say "Later" (which I chose)
- Skype for Business started, connected and worked flawlessly
I rebooted and upon the launch of Skype for Business I now get the Lync 2013 front-end (without any questions asked).
How can I recover Skype for Business -- it is obviously possible to run it since it has been running after the first install, I believe that there will be a magical registry switch which would enable one or the other (bypassing the server check).
NOTE: I am aware why the Lync client has been forced and all the consequences to bypass a setting enforced at server level (this comment is to avoid answers around the ethical and workload related warnings ("If they did it there is a reason" -- I welcome the technical issues which will also be useful for the Lync administrators)