Check capitalization and make sure the file name does not contain typos or other spelling errors.
    Check that the file has not been moved, deleted, or renamed.

Hello I am asking for help in solving the following problem. I have purchased a new computer to which I want to transfer all e-mails from the previous one. I installed Thunderbird and copied the entire Thunderbird folder to the new computer. After opening the application, I can see all e-mail topics but no content. The following message appears in the body of the e-mail: It was impossible to find the file "mailbox: /// C: /Users/Janusz/AppData/Roaming/Thunderbird/Profiles/3vhd9ch7.default/Mail/serwer1721174.home-1.pl/Inbox? Number = 3231". Check the path to the file and then try again. Check capitalization and make sure the file name does not contain typos or other spelling errors. Check that the file has not been moved, deleted, or renamed. Can someone help me eg via remote desktop?