Well, at first sight, I would to say I have the same bug with U12.04 LTS
[uname gives 
Linux A64 3.5.0-29-generic #49~precise1-Ubuntu SMP Wed May 8 00:08:45 UTC 2013 
x86_64 x86_64 x86_64 GNU/Linux 
apt-cache policy unity gives
unity:
  Installé : 5.18.0-0ubuntu2
  Candidat : 5.18.0-0ubuntu2 
...]

1) TB doesn't appear in the dashboard when  I type "thunderbird" while
it is already installed.

2) I launch TB with a terminal. The icon in the Launcher is a grey
question mark, not the nice blue bird. If I select "keep in the
launcher" on the TB icon, then log out then log in again , TB is not
kept in the Launcher.

3) I lauch TB, again with a terminal. The grey icon for TB appears in the 
launcher, ok. Then I use dconf-editor for a check. 
When I set "keep in the launcher" on TB icon, dconf-editor shows immediatly the 
item 'thunderbird.desktop' in the favorites list (see desktop/unity/launcher in 
the left panel), but if I set "keep in the launcher" for another application 
that is not already in the list (for instance dconf-editor), then 
'dconf-editor.desktop' appears and 'thunderbird.desktop' is deleted. 
 
Too much entries ? No. 
If I launch another application (gparted),  I may keep it in the launcher, its 
item 'gparted.desktop' is added in the favorites list and the one of 
dconf-editor is always in the list.

Now, if I remove gparted, dconf-editor stays in the list of favorites
and so on.

At second sight, I found a strange file 
~/.local/share/applications/thunderbird.desktop which properties are:
Command: /opt/thunderbirdV14/thunderbird %u
This is a remaining of my previous install (U10.04 LTS). I needed to install TB 
V14 in /opt instead of the standard install for an obscur reason of french 
locating missing( hey, that's sound the very first post). It seems the upgrade 
to U12.04 is corrupted by this old file although it seems the right file is at 
the right place: ~/.gnome2/panel2.d/default/launchers/thunderbird.desktop.
Then I deleted the .desktop in .local and all is ok now: TB is visible in the 
Dashboard, the blue icon is used, TB stays in the Launcher.

All this to give perhaps a clue to other users having the same troubles.

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https://bugs.launchpad.net/bugs/765736

Title:
  Thunderbird won't stay in launcher and no quicklist

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