has released Mozilla 1.6, a new version of its open-source Web-browser, e-mail and newsgroup client. The updated version offers several enhancements to Mail, including an option to separate the Recipient and Sender columns in the thread pane, a preference for placing the user’s signature above the quoted text, vCard support, and a “Remove from server after x days” option for POP3 accounts. Mozilla 1.6 also includes a new cross-platform NTLM authentication mechanism. View the release notes for a complete list of improvements.