First step
To migrate a Courier mailbox to Thunderbird (on Windows XP) you need Courier installed, Thunderbird installed and a program called Courex (get the latest copy here Courexor see the attachments for this page).
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To migrate a Courier mailbox to Thunderbird (on Windows XP) you need Courier installed, Thunderbird installed and a program called Courex (get the latest copy here Courexor see the attachments for this page).
...