Hello, Please can you help to sort out the issue below... For I do not why reason my thunderbird stopped working, the error message is " Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window " I tried to stop the old Thunderbird using Task manager but cant find it running. Now, I saved the Profiles of the initial Thunderbird located in xxx/ Appdata /Roamnig/ Thunderbird/... - I uninstalled the old Thunderbird and Installed a new version ( cant remember the version number of the initial one) , I copied the profiles in the newly created directory xxx/ Appdata /Roamnig/ Thunderbird/ ... but got the same error message. I get stuck here. any help would be highly appreciated thanks lorand