Outlook Add-In Warning
Often the Icewarp plug-in becomes disabled when is detects performance warnings.
Outlook will display a banner you need to interact with.
Select the “View Disabled Add-ins” button.
Under the “Account information” if the “Disabled Add-in” is not open select the “Manage COM Add-ins” button open and enable the Icewarp plug-in.
Apply and OK all changes.