The Microsoft Outlook program tries to protect the user experience by monitoring add-in performance and ‘quarantining’ them if it detects any issues.
We recommend that you set the ‘Always enable this add-in’ feature if you experience any issues with your Mailock add-in.
This feature may be set by clicking the ‘Always enable this add-in’ button in the dialogue box that is displayed when the issue is detected.
Alternatively follow one of these instructions to re-enable the add-in:
Hard disabling can occur if the add-in has caused Outlook to close unexpectedly.
Soft disabling can occur when the Mailock add-in produces an error that does not cause Outlook to unexpectedly close. For example, Outlook might soft disable the Mailock add-in if it throws an unhandled exception while starting the add-in.