For now though, it's an excellent email client, and any features that are missing from its impressive repertoire can be easily patched with downloaded plugins. Thunderbird is currently in the process of becoming an independent project, so it'll be interesting to see which direction it takes once that happens. Mozilla Thunderbird makes e-mailing safer, faster, and easier with features such as intelligent spam filters, a built-in RSS reader, and quick search. Thankfully, downloading and installing extensions in Thunderbird is just as simple as it is in Firefox select 'Add-ons' from the main menu and you'll be presented with a store where you can download and install all kind of extras to enhance your email experience. It is a port of Mozilla Firefox for PowerPC -based Macintosh computers running Mac OS X to retain compatibility with the older architecture and older.
Which is better or what is the difference I am a Firefox believer on.
To add that extra functionality, you'll need to download an extension called Provider for Google Calendar. Ive never used Thunderbird but have always used the Mac OSX mail builtin program. Adding a Google calendar to Thunderbird is easy too (use the main menu to connect it just as you would another email address), but you'll only be able to view events - not edit them, or create new ones.