Mozilla Thunderbird Portable (Legacy) for Windows makes emailing safer, faster, and easier than ever with intelligent spam filters, a built-in spell checker, extension support, and much more. Also available here as an installer.

Mozilla Thunderbird is designed to be a very safe, fast email client that's also easy to use. It includes many great native features, including quick message search, customizable views, and IMAP/POP and RSS support.

This email client provides many essential features for the organization and your incoming and outgoing mail safety. Thunderbird's junk mail filtering will benefit you, effectively analyzing all mail and identifying those with the highest probability of being junk mail. It will also allow you to select any that may sneak through manually. It also utilizes enterprise and government-grade security features like digital signing, message encryption, S/MIME, support for certificates, and security devices.

Mozilla Thunderbird will also permit almost unlimited additional features through the available Mozilla Add-Ons. These add-ons can be indispensable tools for building an email client to meet your specific needs.

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Mozilla Thunderbird Has Both Junk and Spam Folders