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Proton Mail is the world's largest secure email service with millions of users, and the service requires extensive infrastructure and expertise to run. You can support the service by upgrading to a paid account. The app is open source and basic accounts are always free. The secure email service is fully integrated with an encrypted calendar, enabling you to keep your events private as well. Proton Calendar and Proton Drive extend privacy to your events and documents. You can send and receive emails normally. ProtonMail for Windows PC secure email accounts are fully compatible with other email providers. It can be used on any device without software install.
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