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We provide this software to you free of charge as a service directly in the shop. Download the software using the download link, install it and get started. No registration and no key required.
The usage and promotion of open standards is one of Thunderbird's key values; this focus is a rejection of our world of closed platforms and services that can't communicate with one another. We want our users to be able to communicate in their own way.
Because Thunderbird is an open-source project, anyone can contribute ideas, designs, code, and time to assist other users.