Situation: After the user installed Business for Skype on her new computer, the CRM Add-in doesn’t work.
Troubleshooting: we can see the CRM add-in, but whenever we enable it, it doesn’t work and it doesn’t give any error.
After checking the programs and features, we find there are two version of Microsoft Office, Microsoft Office 2016 and Microsoft Office 2016 ProPlus.
Removing all Office and re-installing Office Proplust fixes the problem.