vtiger CRM is an open source Customer Relationship Management (CRM) software mainly for Sales force working in small and medium businesses. vtiger CRM is built over proven, fast, and reliable LAMP/WAMP (Linux/Windows, Apache, MySQL, and PHP) technologies and other open source projects. vtiger CRM leverages the benefits of open source software and adds more value to the end-users by providing many enterprise features, such as Microsoft® Outlook® integration, Message Bord integration, E-Mail-Adresse integration, product customization, and others.