Outlook Express Application Programming Interface is the best Software Development Kit (SDK) to build your plugin in Outlook Express® and Windows Mail®. OEAPI enables your software to reach more than 400 million users worlwide with Outlook Express® and Windows Mail® already installed. Our customers have been using OEAPI for a wide range of applications: - Anti Spam & Anti Phishing - Automatic encryption of emails - Anti Virus - Customer Relationship Management (CRM) (i.e: Salesforce AppExchange) - Contacts synchronization & backup OEAPI component has support for GUI customization, Messages management, MIME handling and many other nifty features.