[Bug 643736]

[Mbanner]

We actually did this in bug 690316.

app.update.silent looks like just a way to hide the prompts prior to the
actual update.

*** This bug has been marked as a duplicate of bug 690316 ***

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https://bugs.launchpad.net/bugs/643736

Title:
  "What's new in Thunderbird 3" reappears on minor upgrades

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