How to export local folders and mails from Thunderbird and import these mails into "proton mail" online folders?
I have installed "proton mail". All the Thunderbird online mails have been able to be transferred to "Proton" by "proton mail bridge". My question is: how to export the local saved folders and emails and then import them into "Proton Mail" online folders?
Edition Windows 11 Home Version 24H2 Thunderbird 142.0 (64-Bit)
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Uploading to IMAP is problematic, as IMAP was never designed for high volumen uploads. I suggest creating a manual filter that selects all messages in a folder and COPIES (not moves) to an online folder. Don't delete the local copies until you verify that the copy was successful.
I found the solution:
This LINK shows you how to move mails from TB to Proton
https://proton.me/support/import-export-mbox-eml-using-proton-mail-bridge