We use thunderbird on 3 PCs here for receiving and sending messages via some outlook mailboxes. However Thunderbird has stopped working on one PC. It shows the home screen saying 'Thunderbird Mail - Inbox' at the top and then 'Email' , 'Accounts' and 'Advanced Features' in the grey boxes. Normally if you click on one of the 2 inbox's on the left it will display that inbox but it does nothing, if I right click on one of the inbox's and click open in new tab it then shows the inbox in another tab but I can't reply to any emails? If I select restart with add ons disabled it does nothing, same when I click Tools and then options. It is running windows 7 32bit and has no software installed on it that the other 2 PCs don't have. I have tried unsinstalling Thunderbird and then reboot and then re install and it loads up straight away with all the same settings still?