This is related to Thunderbird global indexer. It is @§$%&(/=?*'{[!"@@ 
inefficiently written. And while indexing killing the whole system. Second 
point: the indexer does a full index every time a new mail arrives. And to make 
the whole messy: it starts over and over again -- even if it is already running 
for every mail arriving!! In short: if two mails arrive, two indexer threads 
are started. If four mails arrive four. If 100 mail arrive, 100. Quite clear 
now why Thunderbird renders every machine it is installed unusable -- 
especially if the indexer is started before the previously started indexers 
finished. from time to time I have about 1000 indexer threads running ...!
That is a real bug! If one indexer was started, it shall block starting further 
indexers, running them later, after it has finished, not trying to start as 
many as the system allows!

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https://bugs.launchpad.net/bugs/704623

Title:
  thunderbird renders system unusable

Status in “thunderbird” package in Ubuntu:
  New

Bug description:
  Binary package hint: thunderbird

  After starting Thunderbird, then open any available nntp-server
  (news.gmane.org, or news.individual.org (you'll need an account to
  access this server)). Thunderbird will immediately block on any
  newsgroup with a reasonable amount of new messages. It will consume
  100% CPU, slow down the whole system significantly. After a while
  Thunderbird is grayed out most of the time. You can't access it
  anymore. Sometimes this lasts for hours. Working with Thunderbird is
  impossible.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: thunderbird 3.1.7+build3+nobinonly-0ubuntu0.10.10.1
  Uname: Linux 2.6.36.2 x86_64
  Architecture: amd64
  Date: Tue Jan 18 21:29:52 2011
  ProcEnviron:
   PATH=(custom, user)
   LANG=de_DE.utf8
   SHELL=/bin/bash
  SourcePackage: thunderbird

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