Mozilla earlier this week issued a public beta of the next version of its Thunderbird e-mail client, making enhancements to the overall design of the product as well as improved support for extensions, the plug-in architecture for the application. In addition, new features including the use of tags as a way to organize e-mail, and forward and back buttons to cycle through e-mail much like web pages were also added. The beta is available for the Windows, Mac OS and Linux platforms.

In separate news, Mozilla delayed an expected security release for versions 1.5 and 2.0 of its Firefox browser. Originally scheduled to be delivered automatically to users starting this Tuesday, the update has been pushed back to December 19. No reason for the delay was given.

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