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Thunderbird version 52 and above are no longer supported on Mac OS X 10.6, 10.7 and 10.8. Learn more about your options.

{for win,linux}{warning}This article applies to Mac users only.{/warning}{/for} Starting with Thunderbird version 52, [https://www.mozilla.org/thunderbird/system-requirements/ Thunderbird requires] Mac OS X 10.9 (Mavericks) or higher. If you are on an earlier version of Mac OS X, there are options for you to continue using a secure version of Thunderbird. {note}Visit this [https://support.apple.com/HT201260 Apple Support page] to find your Mac OS version.{/note} =Option 1: Upgrade to a Mac OS version supported by Apple= To ensure the safest email experience, we recommend upgrading to a Mac OS version that Apple supports. Visit this [https://support.apple.com/HT201475 Apple Support Page] to learn more about upgrading. While Thunderbird will still continue to work on unsupported versions, using Thunderbird on a supported version will provide you with the best and safest user experience. =Option 2: Download Thunderbird version 45= Thunderbird 45 will continue to work with Mac OS X 10.6, 10.7 and 10.8 but will not receive any further updates or security fixes. Thunderbird 45 can be downloaded from [https://ftp.mozilla.org/pub/thunderbird/releases/45.8.0/mac/ here]. First pick the folder for your locale and then download the package.