On 2020-07-08 13:04, Carsten Schoenert wrote:
Hello Gary,

Am 08.07.20 um 16:22 schrieb Gary Dale:
    * What exactly did you do (or not do) that was effective (or ineffective)?
I quickly discovered that Thunderbird only lets you copy e-mail, not
folders of e-mail. WHile there used to be a plug-in to handel moving
folders, it apparently doesn't work with current versions of
Thunderbird.

I can simply drag a folder and push it to the desired new account or subfolder. At least a single folder is than copied to the target folder/account.

Long long ago were I moved away from POP3 to IMAP I moved all my local stored folders and emails within the account to the local structure. And afterwards I used the same technic to move my emails back to the newly created IMAP setup. Was working without any problems.

Have you tried this recently? Right now, I can copy a single folder (apparently) but it is empty in the IMAP inbox. I have to then copy the e-mail the POP3 folder contains.


And the file structures of POP3 inboxes appear to be
different from the file structurs of IMAP inboxes so that copying the
POP3 files outside of Thunderbird merely results in them being erased
when Thunderbird restarts.

No, Pop3 vs IMAP is a server related detail. Thunderbird is storing emails locally by the mbox format as default. In recent versions you can choose for new accounts to use maildir as storage back end. But the suggestion is still to use the mbox format. You can simply copy these folders and the index file manually to the target folder or system.

But this is completely independent to the email server you like to use.

Sorry, but again this doesn't work. I noted that Thunderbird does create a .sdb folder for folders that contain other folders, but not for folders that only contain e-mail. This is the same for both mail account types but copying the folders from a POP3 account to an IMAP one results in the removal of the folders and files the next time Thunderbird starts up.

Thunderbird apparently only accepts folders that it creates within an IMAP mailbox. And as per my e-mail at 10:13 EDT, it doesn't even make that easy.

Perhaps at one point Thunderbird behaved better, but it's not doing things all that well right now.

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