Hello, I'm a Thunderbird user in Japan. I'm sharing my work with my co-worker, therefore, we have received exactly same emails on Thunderbird. And my email data from Outlook grown too big to handle. So, I would like to install my co-worker's email data to my new Thunderbird which has ongoing email data which is slightly different because I don't have the emails which range of date is from around August 20. Also, the range of date of his data is from around September 10. There is approximately roughly 1 month difference. Therefore, I would like to install his email data. So, I tried to do as below:- My coworker extract "default" data. I changed below to above "default" data. (Above might be slight different, because I did this change on around September 10, so my memory is not sure to correct.) Tool > Account setting > Server Setting > Folder email data are stored Local Folder > Data Import > Import from Thunderbird which was installed separately > Import from "default" profile > Error which cause is unknown Could you kindly let me know how to install the data to my Thunderbird? Version of my PC is Windows11 23H2(OS build 22631.4249) Thunderbird version: 128.3.0esr(64 bit)