[Josem]

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If I understand this correctly, Thunderbird takes e-mail from Yahoo! and puts it in it's own e-mail box. It is not a replacement, just an addition with POP, whatever that means.

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It means that your emails are downloaded and stored on your machine, rather than on Yahoo's server.


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What is the benefit to this opposed to normal e-mail? It really doesn't seem needed.

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Until recently, it was normal e-mail. Webmail is a relatively new thing.