Thunderbird is one of the most popular email client developed by Mozilla. It is open source and can be used in Windows, mac and Linux.
The good news is that Mozilla has updated Thunderbird to version 15.0 which comes with following fixes or updates:
Multi-Channel Chat: You now can enjoy real time conversation with your contacts, right from your favorite messaging application. Do Not Track: This option has been implemented as an addition to Search the Web. Ubuntu One is now supported in Filelink - the option to upload large attachments to online storage services. New User Interface: Thunderbird is replicating the new look and feel of Mozilla Firefox in an effort to provide a similar user experience across all Mozilla software desktop or mobile and all platforms. Various fixes and performance improvements Various security fixes
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