Dat is er wel hoor.
inaninck@LT9:~$ cd .mozilla-thunderbird/
inaninck@LT9:~/.mozilla-thunderbird$ ls
4dj2a3a2.default appreg profiles.ini smilies vlb5bhfc.default
inaninck@LT9:~/.mozilla-thunderbird$ cd 4dj2a3a2.default/
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default$ ls
abook.mab compreg.dat extensions.cache ImapMail localstore.rdf panacea.dat training.dat XPC.mfasl
blocklist.xml cookies.txt extensions.ini impab.mab Mail prefs.js urlclassifier2.sqlite xpti.dat
cert8.db downloads.rdf extensions.rdf install.log mailViews.dat secmod.db US XUL.mfasl
compatibility.ini extensions history.mab key3.db mimeTypes.rdf signons.txt virtualFolders.dat zindus
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default$ cd ImapMail/
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default/ImapMail$ ls
galain.xxxxxxxx.org galain.xxxxxxxx.org.msf
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default/ImapMail$ cd galain.xxxxxxxx.org/
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default/ImapMail/galain.xxxxxxxx.org$ ls
Archives.msf Archives.sbd Drafts-1.msf INBOX.msf INBOX.sbd msgFilterRules.dat Sent-1.msf Templates.msf Trash.msf
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default/ImapMail/galain.xxxxxxxx.org$ ls -l
total 1760
-rw-r--r-- 1 inaninck inaninck 1322 2010-01-21 20:54 Archives.msf
drwxr-xr-x 2 inaninck inaninck 4096 2010-01-21 20:54 Archives.sbd
-rw-r--r-- 1 inaninck inaninck 13289 2010-02-03 22:27 Drafts-1.msf
-rw-r--r-- 1 inaninck inaninck 1111527 2010-02-03 22:27 INBOX.msf
drwxr-xr-x 2 inaninck inaninck 4096 2009-06-22 21:18 INBOX.sbd
-rw------- 1 inaninck inaninck 25 2008-08-21 21:41 msgFilterRules.dat
-rw-r--r-- 1 inaninck inaninck 640860 2010-02-03 22:27 Sent-1.msf
-rw-r--r-- 1 inaninck inaninck 0 2010-02-03 22:14 Templates.msf
-rw-r--r-- 1 inaninck inaninck 2275 2009-12-24 22:28 Trash.msf
inaninck@LT9:~/.mozilla-thunderbird/4dj2a3a2.default/ImapMail/galain.xxxxxxxx.org$
Ik heb laatst op een andere PC Xubuntu geinstalleerd, met ook TB-3 en ik heb de bovengenoemde .mozilla-thunderbird directory van mijn laptop erheen gezet en alles werkt. Duurde alleen even voor die andere PC in sync was met de IMAP server.
Enneh, in Ubuntu is niet alles moeilijk, maar anders dan je gewend bent.
Daarnaast is het gelukkig ook BETER!