Table of Contents
Zindus
Zindus is a Thunderbird extension to sync Thunderbird's address book with your Google (Mail) Contacts and/or a Zimbra installation (in both directions).
Zindus is using HTTPS/SSL to connect to Google and stores POP3/IMAP passwords using the same mechanism that Thunderbird uses to store your POP3/IMAP passwords. The mechanism allows you to use a master password to encrypt stored passwords. See http://www.zindus.com/faq-thunderbird/#toc-security for details.
Installation
Simply use the default installation method. See https://addons.mozilla.org/de/thunderbird/addon/6095 to get the .xpi
.