Knowledge Base

Sync for iCloud potential security concern with certificate


After starting Outlook with CodeTwo Sync for iCloud Add-in potential security concern with certificate warning show up. Due to security problems, add-in is not starting automatically. 

Potential security concern
Fig. 1. Potential security concern with certificate warning.


  1. First, open Outlook application.
  2. Go to the File, Options, Trust Center, Trust Center Settings... and select Macro settings
  3. Uncheck the "Apply macro security settings to installed add-ins" option. Hit Ok button and then exit Outlook application.
  4. Now, hit on your keyboard Windows + R, and then type regedit and click Ok.
  5. The Windows Registry Editor will show up. Please navigate to following path:
  6. HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\C2FolderSyncCloudAddin.C2FolderSyncClou
  7. On the right side of the windows you should find entry named LoadBehavior.
  8. Double-click on it and change value to 2Click Ok and just close Registry Editor.

    Fig. 2. Changing registry key value.

  9. Now you can open again Outlook application and CodeTwo Sync for iCloud Add-in should run automatically.