This can be enabled to display detailed error messages when loading VSTO add-ins, such as the Egress add-in.

1. Make sure Outlook is closed.

2. Select Computer Properties:

  • Click Windows Start Menu
  • Right-click on Computer and select 'Properties' (Highlighted below)


 3. Locate System Properties dialog by selecting 'Advanced System Setting'



 4. Select environment variables



 5. Select 'New' and enter 'VSTO_SUPPRESSDISPLAYALERTS' with a value of zero (0).


6. Click 'OK' and restart Microsoft Outlook

7. Go to Options\AddIns in Outlook and try and enable the Egress Add-in. You should now get the full error of why the addin is not loading.

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