Not much in new Thunderbird 5, but roadmap looks promising

Mozilla has released version 5 of Thunderbird, the popular open source e-mail client. The update includes some new features, updated components under the hood, and a number of performance and stability improvements.

Mozilla spun off Thunderbird in 2007, creating a separate organization called Mozilla Messaging. The split was reversed several months ago when Mozilla announced that it would reabsorb the messaging group and integrate it into Mozilla Labs.

The Thunderbird development model underwent some significant changes alongside the organizational restructuring. Its versioning and development cycle have seemingly been harmonized with that of Firefox. The Thunderbird version number was bumped up directly from 3.x to 5—skipping version 4 entirely. This change allows Thunderbird’s version number to match Firefox and reflect the version number of the underlying Gecko rendering engine that is shared between both applications.

Read more at ars technica

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