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I am changing email provider, and I don't want to lose my old emails when Thunderbird syncs to the new provider. How do I insure that I do not lose my old email

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My email address is not changing, but my service provider is. I want to make sure that none of my existing emails are lost when I synchronize to the new service provider. There are a number of us with this problem. Before changing the providers, Thunderbird would update the email everyday so that it mirrored what was stored on the server. Obviuosly, I don't want to lose all my existing emails on my computer when I sync to a new provider. Is ther some way to only download the new email, and not delete the emails on my computer?

My email address is not changing, but my service provider is. I want to make sure that none of my existing emails are lost when I synchronize to the new service provider. There are a number of us with this problem. Before changing the providers, Thunderbird would update the email everyday so that it mirrored what was stored on the server. Obviuosly, I don't want to lose all my existing emails on my computer when I sync to a new provider. Is ther some way to only download the new email, and not delete the emails on my computer?

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Can you confirm your account type - POP or IMAP?