To get your Efficy addins back in Outlook, please go to File.
Go to options.
Then go to the Add-Ins tab.
You can see Efficy Outlook Add-In in the Inactive Application Add-ins list.
select Manage "Com Add-ins" and click on "Go..."
check "Efficy Outlook Add-in" and click "OK".
Congratulations! Your addins are back!