The document discusses Trustedbird, an open source secure email client based on Mozilla Thunderbird. It was created by the French Ministry of Defense to provide security features for the military, industry, and government. Trustedbird provides services like encrypted signatures, secure headers, multiple LDAP directory support, and an extended email format called XIMF that allows custom headers for security classification and project identification. A demonstration showed features of signed and encrypted emails using Trustedbird. The conclusion discusses plans for Trustedbird to be integrated into more French government systems and to contribute patches to Thunderbird where possible.