Message from CEO Mimecasters, Marc van Zadelhoff Our shared goal is to ensure the security and prosperity of organizations, and we are proud to be their trusted cybersecurity partner. Our rapid growth is a testament to each of your contributions, which have helped us expand our customer base and deliver top-notch cybersecurity solutions. Our full potential can only be met if we all maintain the highest level of integrity and ethical standards. We all have a personal responsibility to deal honestly and fairly with our customers, prospects, partners, competitors, and each other. This commitment to integrity is core of who we are as a company and is a shared value across Mimecast. The Mimecast Way provides us with values, and the Code of Business Conduct and Ethics provides us with tools to make the right decisions. All Mimecasters have an individual and corporate responsibility to uphold our Code. Please familiarize yourself with it in its entirety and incorporate it into your daily business activities. Sincerely, Marc van Zadelhoff ©©22002244 MMiimemecacasst.t. AlAlll RRiigghhtsts RReesseerrvveedd.. 33