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I've used the ImportExportTools NG Thunderbird addon to do the migration. I.e. right-click on all folders I want to download, start a new Thunderbird for the n

by DrTung 6y ago

I've used the ImportExportTools NG Thunderbird addon to do the migration. I.e. right-click on all folders I want to download, start a new Thunderbird for the new mail provider, right-click on the new, empty folders and upload to them.