If you downloaded Thunderbird from the Mozilla site, click the Open button. Note: When you run Thunderbird for the first time, newer versions of Mac OS X (10.5 or later) will warn you that the application Thunderbird.app was downloaded from the Internet. Choosing the Thunderbird icon from the Dock lets you quickly open Thunderbird from there. Optionally, drag the Thunderbird icon from the Applications folder into the Dock.Drag the Thunderbird icon into your Applications folder.If the volume did not mount automatically, open the Download folder and double-click the disk image to mount it. When the download is complete, the disc image may automatically open and mount a new volume called Thunderbird. If you want to use Thunderbird in a different languages or with a different operating system, click the Other Systems and Languages link on the right side of the page and select the version you need. After the installer has finished downloading open it and drag the Thunderbird icon into the Applications folder. This page detects your computer's operating system and language, and it recommends the best version of Thunderbird for you to use. Use your web browser to visit the Thunderbird download page at.Mozilla recommends 512 MB of memory or more An Intel x86 or PowerPC G3, G4, or G5 processor.Thunderbird will run on a computer with at least the following hardware: Thunderbird runs on Mac OS X 10.4.x and later.

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