You can get advice on IRC in #tb-qa. http://wiki.mozilla.org
/Thunderbird:QA_TestDay:2009-10-22 has tips and starting points.
Please join us this Thursday in #tb-qa or
http://www.mibbit.com/chat/?server=irc.mozilla.org&channel=%23tb-qa
Ludovic
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Ludovic Hirlimann MozillaMessaging QA lead
http://www.spreadthunderbird.com/aff/79/2