Thunderbird need to update to thunderbird 13

[Mozaic]

Thunderbird come 5 juin 2012, but in Ubuntu we don't have Thunderbird in Ubuntu's repository.
We have a ppa (https://launchpad.net/~chrisccoulson/+archive/mozilla-test) but, Thunderbird resolve 3 criticals security's bugs (https://www.mozilla.org/security/known-vulnerabilities/thunderbird.html , the fourth is for windows) and it's should be better for Ubuntu's security to update to Thunderbird 13.

Expected: Upgrade to Thunderbird 13

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: thunderbird 12.0.1+build1-0ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
BuildID: 20120430060637
Date: Fri Jun 15 09:48:14 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
SourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)

[Micah Gersten (micahg)]

Packages are in ppa:ubuntu-mozilla-security and most likely will go out on Monday.

[Micah Gersten (micahg)]

Duplicate of bug 1007556 (duplicate marking is timing out ATM)