Please be specific on the exact things you did. Renaming the system folder, creating a new folder, and reintegrating the accounts is too vague for us know exactly what you did. In referring to the system folder, I presume you meant the appdata\roaming\thunderbird folder, but maybe you meant the profile folder. Again, specifics will help. Thank you.

Sehr unklare Beschreibung des Problems. Weshalb wurde "Systemordner Thunderbird" umbenannt? Welche Sicherungen welcher deiner Daten hast du durchgeführt? Funktioniert dein neues Profil wieder? Falls ja, was möchtest du von uns wissen?

Problem: Thunderbird synchronisiert einige E-Mailkonten nicht mehr.

Folgende Maßnahmen durchgeführt: 1. Weitere Sicherung: unter Profilordner Appdata / Roaming/ thunderbird, den Ordner in Thunderbird_alt umbenannt, 2. Thunderbird deinstalliert danach aktuelle Version heruntergeladen und neu installiert 3. Somit wurde ein neuer Profilordner erstellt, 4. Nun wollte ich aus dem Profilordner unter Appdata / Roaming/ thunderbird_alt die lokalen Ordner kopieren und in den neuen Profilordner einfügen. Leider waren nun alle Profile nicht mehr da? Das hatte ich bisher nicht! Diese wurden auch nicht gelöscht. Der Papierkorb ist leer. Ebenso wurden durch MacriumReflect die Profilordner von Thunderbird auch nicht vorher gesichert? Nun sind alle lokalen E-Mails weg? Wie kann das sein? Wie bekomme ich diese wieder? Gerne höre ich von Ihnen

Problem: Thunderbird is no longer synchronizing some email accounts.

I've taken the following steps:

1. I made another backup: I renamed the profile folder to Thunderbird_old in the AppData/Roaming/Thunderbird profile folder.

2. I uninstalled Thunderbird, then downloaded and reinstalled the latest version.

3. This created a new profile folder.

4. I then tried to copy the local folders from the profile folder in AppData/Roaming/Thunderbird_old and paste them into the new profile folder. Unfortunately, all the profiles are now gone! This has never happened before! They weren't deleted, and the trash is empty.

Also, Macrium Reflect didn't back up the Thunderbird profile folders beforehand.

Now all my local emails are gone?

How is this possible? How can I get them back?

I look forward to hearing from you.

Systemordner Thunderbird umbenannt und neues Profil erstellt, alle E-Mail Konten neu integriert, Teste i.O.,

Aus alten Thunderbird Ordner war plötzlich keine Profilordner mehr vorhanden? Wieso plötzlich das? Sicherungen hatten leider auch keinen Profilordner von Thunderbird gesichert. Warum werden diese nicht gesichert?

Which was the reason for renaming your Thunderbird folder in Thunderbird-old and create a new Thunderbird installation? The simplest way to copy/paste your Local Folders from the old Thunderbird profile would have been to go ...\Mail\Local Folders\ in the old profile folder, copy the Local Folders folder and past it in the same registry \Mail\ in the newly created profile folder xxxxxxxx.default-release (or whatever it's his name).

When you write "local folders" do you mean local folders in general such as Inbox, Sent, ...in a POP account or do you mean the "special account" Local Folders which is generally displayed below the other account folders in the folder pane on the left ?

citation " I then tried to copy the local folders from the profile folder in AppData/Roaming/Thunderbird_old and paste them into the new profile folder. Unfortunately, all the profiles are now gone! This has never happened before! They weren't deleted, and the trash is empty." ....... and... "Problem: Thunderbird is no longer synchronizing some email accounts". Your problems are still very difficult to understand! Aren't you confusing profiles and accounts?

Which server type did you use for your email accounts, IMAP or POP? Which is your OS? Which is your actual version of Thunderbird?

Please show screen shots of • the contents of the folder "Profiles" in Thunderbird folder in your new installation • idem for the contents of the file "profiles.ini" in the Thunderbird folder The same screen shots with contents of "Profiles" and "profiles.ini "in Thunderbird-old