As it is officially dead. Thank you.
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Thunderbird isn't dead. It's still being actively maintained for any bugs or security issues. As more and more folks have switched to web-based email, there are not many email clients that are open source and maintained anymore. I'm not aware of any with the featureset of Thunderbird.
Sometimes, the impossible can become possible, if you're awesome!
There is a big difference between dead and something that Mozilla have felt is stable enough to leave be.
And as John said above, it will still be maintained for security/bug fixes, just no new features, so it isn't dead at all.
I am not aware at the moment of any open source/free alternatives but there is a commercial product based off the Thunderbird code base.
Postbox (http://www.postbox-inc.com/) seems to be pretty well reviewed from what I have read previously.
It has social network and cloud storage support, but I can see no specific mention of portability, instead seeming to require an install which being a commercial product is typically the case.
If at first you do not succeed, use more sticky tape.
The freeware Postbox product is unmaintained and has unpatched bugs. I'm not sure if Postbox proper is being patched regularly as Thunderbird bugs are patched or not.
Sometimes, the impossible can become possible, if you're awesome!
Is there a freeware version of Postbox? Just a 30-day free trial what I have found on their home page.
Here is what I like so far: Google bought Mac client Sparrow. If they release it for free, of course for Windows, too, that would be my choice. But that's just pure speculation so far, though.