It worked fine to install and run the following programs
- Lync 2013 as part of Office 2013
- The latest Lync Updates
- Lync Connectivity Analyzer
- Lync Planning tool
- Lync Stress and Performance Tool
- Profiles for Lync (the "sticky" version)
- Attendant Pro for Microsoft Lync
And even the Lync Server 2013 administrative tools worked fine, the Topology Builder, Lync Control Panel (with silverlight) and the Management Shell.
So, welcome Windows 10!