Approved by Jerry Cantu

Skill Level - Description

https://www.thunderbird.net/en-US/

Thunderbird makes email better for you, bringing together speed, privacy and the latest technologies. Focus on what matters and forget about complexity.

Open Source (Free)

https://addons.mozilla.org/en-us/thunderbird/addon/duplicate-contact-manager/

3/5 - 91 user reviews

Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts

https://addons.mozilla.org/en-us/thunderbird/addon/google-tasks-sync/

Manage your tasks from Thunderbird, even while offline

https://addons.mozilla.org/en-US/thunderbird/addon/provider-for-google-calendar/

This extension allows Lightning to read and write events and tasks to a Google Calendar. This add-on requires the following add-ons to work properly: Lightning

http://sourceforge.net/projects/mozbackup/

A utility for creating backups of Firefox, Thunderbird, SeaMonkey and some others applications. It allows you to backup and restore bookmarks, mail, contacts, history, extensions, cache etc.

Open Source (Free)

https://addons.mozilla.org/en-us/thunderbird/addon/lightning/?src=search

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email

https://support.mozilla.org/en-US/kb/using-lightning-google-calendar

This article describes how to use Google calendars together with Lightning

https://addons.mozilla.org/en-US/thunderbird/addon/google-contacts/?src=search

Access to Google contacts and synchronize them with Thunderbird address books