In case you want to import back contacts and groups extracted by script from this post, download and use script below. It is quite simple script using Lync 2013 SDK, which was tested with both Lync 2013 & Skype for Business 16 Clients.
PowerShell must be executed in Administrator context in order to allow the script to run.
Download script and assemblies here (ZIP):
Pingback: Scripts based on the PowerShell implementation, but with some bonuses - Lync / Skype for Business contacts export/import tool – random stuff
Thanks for sharing that!