Prior to the release of Thunderbird 13, the Dropbox feature which allowed users to attach large files from The Cloud (after uploading through Dropbox) had been removed [Bug 754993]. I recall early on there were some security concerns about this feature from business users. They had wanted the ability to disable this feature so that proprietary information couldn’t accidentally be placed on The Cloud. Now, it is being restored, as an add-on with a target milestone of Thunderbird 16 (due for release around October 9, 2012) [Bug 763471].
Thunderbird 16
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Just Released None Coming Soon June 5th Thunderbird ESR 10.0.5 Thunderbird 13 Thunderbird 14 Beta (14.0b1)* Thunderbird 15 Earlybird (15.0a2)* Future Releases July 17th Thunderbird ESR 10.0.6 Thunderbird 14 Thunderbird 15 Beta (15.0b1)* Thunderbird 16 Earlybird (16.0a2)* * As part of the new Rapid Release Schedule,dates listed for Earlybird and Beta builds reflect when the code merge is set to begin. The actual release to that particular channel may vary by several days. See the Wiki for more details.
Just Released April 24th Thunderbird ESR 10.0.4 Thunderbird 12.0.0 April 26th Thunderbird 13 Beta (13.0b1)* April 27th Thunderbird 14 Earlybird (14.0a2)* Coming Soon June 5th Thunderbird ESR 10.0.5 Thunderbird 13 Thunderbird 14 Beta (14.0b1)* Thunderbird 15 Earlybird (15.0a2)* Future Releases July 17th Thunderbird ESR 10.0.6 Thunderbird 14 Thunderbird 15 Beta (15.0b1)* Thunderbird 16 Earlybird (16.0a2)* * As part of the new Rapid Release Schedule,dates listed for Earlybird and Beta builds reflect when the code merge is set to begin. The actual release to that particular channel may vary by several days. See the Wiki for more details.