Desactivate the outlook plugin

In Outlook 2010 to 2016, go to the File menu. Click on the "Options" menu, 

In Outlook 2007, go to the Tools menu, Compatibilty center. 

In the window that shows, click on  "Add-ins" .
At the bottom on the new window click on "Go..." bt

Uncheck "SigiliumAddin" and restart Outlook.

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