Hi there! When I opened the thunderbird in the morning, I don't know if i clicked the wrong button, all my emails and the folder i set was gone, now it just shows the initial folder with only the emails I received today. When I use the search engine to search, it still shows a search result in which I can see the first few lines of emails I received in the past, but when I try to click into it to check details, it's empty, I couldn't see any content. What has happened and how can I fix this? Thanks in advance!