Starting with Thunderbird version 52, 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.
Installing Thunderbird on Mac OS X Thunderbird runs on Mac OS X 10.4.x and later. Thunderbird will run on a computer with at least the following hardware: An Intel x86 or PowerPC G3, G4, or G5 processor; 256 MB of memory. Mozilla recommends 512 MB of memory or more 200 MB hard drive space; Download and Install Thunderbird. Access to a Mac developer account will get you access to a Yosemite download link immediately. One other way of trying out Yosemite early is to apply for the open beta program, which will kick.
Update Mac Yosemite
To ensure the safest email experience, we recommend upgrading to a Mac OS version that Apple supports. Visit this Apple Support Page to learn more about upgrading.
Games Download For Mac
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.
Thunderbird For Mac Reviews
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 here. First pick the folder for your locale and then download the package.