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Thunderbird suddenly retrieves all my 2000+ emails from the Yahoo pop server every time I check my mail. My account setting is to have the mails stored on the server until I delete them.

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You should mark the answer below as "Answered" with the check mark if it solves your problem... – MoonSire Apr 10 '13 at 5:52

You may need to delete the popstate.dat and let Thunderbird recreate it (that's the file that keeps track of which messages have been downloaded). See this for details. It will have to download all the messages one more time, and then it should be able to keep track.

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Following the steps given, the problem is solved. Thanks. – skannloh Jun 14 '11 at 17:50

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