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How do I download messages a second time?

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I've lost of a couple of weeks of email from my local folders. They are all still available in my webMail and I'd like to download them again. I've logged into webmail and set all of the messages to unread. However, when I try to get new messages TB tells me that there are no new messages to download.

This is a POP account. How do I force TB to download the messages that are marked as unread?

I've lost of a couple of weeks of email from my local folders. They are all still available in my webMail and I'd like to download them again. I've logged into webmail and set all of the messages to unread. However, when I try to get new messages TB tells me that there are no new messages to download. This is a POP account. How do I force TB to download the messages that are marked as unread?

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You need to delete the file popstate.dat. Read this thread first: https://support.mozilla.org/en-US/questions/999111