The Mozilla Foundation has released the second iteration of Thunderbird, the open source e-mail, feed reader and newsgroup application. Thunderbird 1.5 is now available in 24 languages (with more to come in the next few days) for Windows, MacOS X and Linux platforms.

It is the most important update to Thunderbird since its initial release in December 2004, and it is full packed with new features and bug fixes:

• Automated update to streamline product upgrades. Notification of an update is more prominent, and updates to Thunderbird may now be half a megabyte or smaller. Updating extensions has also improved.
• Sort address autocomplete results by how often you send e-mail to each recipient.
• Spell check as you type.
• Saved Search Folders can now search across multiple accounts.
• Built in phishing detector to help protect users against email scams.
• Podcasting and other RSS Improvements.
• Deleting attachments from messages.
• Integration with server side spam filtering.
• Reply and forward actions for message filters.
• Kerberos Authentication.
• Auto save as draft for mail composition.
• Message aging.
• Filters for Global Inbox.
• Improvements to product usability including redesigned options interface, and SMTP server management.
• Many security enhancements.