Conversation History not working

rm -rf ~/Library/Containers/com.Microsoft.SkypeForBusiness/Data/Library/Application\ Support/com.microsoft.SkypeForBusiness

rm –rf ~/Library/Containers/com.Microsoft.SkypeForBusiness/Data/Library/Caches/com.microsoft.SkypeForBusiness

rm -rf ~/Library/Containers/com.Microsoft.SkypeForBusiness/Data/Library/Saved Application\ State/com.microsoft.SkypeForBusiness

rm -rf ~/Library/Containers/com.Microsoft.SkypeForBusiness/Data/Library/Caches/com.microsoft.skypeforbusiness.shellapp

rm -rf ~/Library/Containers/com.Microsoft.SkypeForBusiness/Data/Library/Preferences/com.microsoft.SkypeForBusiness.plist

defaults delete com.microsoft.SkypeForBusiness

You can find these commands and paths in the "Academy MAC Dec 2106.pptx"