It is easy to access your emails from different machines if required
I have an easier way to avoid email problems when moving to a new computer than moving the folders. If you change your email service to use Imap rather than Pop3, your emails are stored on the email server and not removed when you read them. Emails are normally deleted when they are downloaded on Pop3 services. This also makes it possible to work with your email on more than one computer without missing anything. You can move emails into folders as the folders are kept on the server, too.
Most free webmail services, including Gmail and Yahoo Mail, offer this kind of access. In fact, with Yahoo it is enabled without having to alter your account. When you start the new account wizard in Thunderbird and enter your email address, it will offer the choice between Pop3 and Imap Select the map option and click OK. Thunderbird will add Imap access to your account.
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