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por krazycat el Sept. 19, 2018 · enlace permanente

@Harry Yes, I simply installed an older version of Thunderbird overwriting the newer one, then after sorting the folders, I updated it to v 60b11 (current) again. This works with portable Thunderbird also. I have two separate groups of mail accounts, one in portable TBird, the other installed. since TBird allows only one (open) instance, profile conflicts aren't a problem. (Unlike Firefox, which will corrupt your user profile if you forget to close one.)