Deleting email folders on my hotmail/outlook also deleted them on coresponding thunderbird account and I can't recover them.
My thunderbird synchronization and storage settings set to save messages to my computer, but after deleting messages and folders in my actual hotmail account, the same messages and folders were deleted from the corresponding thunderbird account. I lost thousands of messages. Can they be recovered? both emails and folders were deleted and I could not undo the actions in hotmail.
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Move messages that you want to keep to the Local Folders "account" in Thunderbird.
The synch settings are to do with local cache copies to make working in Thunderbird faster, so it doesn't have to download a message each time you view it. Synch isn't intended to provide permanent storage. The whole premise of IMAP is that messages are stored on the server and not on clients.
So if you detach messages from the IMAP server by moving them to Local Folders, they are yours and of no further concern to the server.