The last message received cannot be deleted. Deleting it only works until a TBird restart. When click on get messages, it usually hangs up. Can write and send messages. i7 processor, Windows 7 and Norton 360 Some entries from the Error Log Could not read chrome manifest 'file:///C:/Program%20Files%20(x86)/Mozilla%20Thunderbird/chrome.manifest'. Timestamp: 6/24/2015 2:44:52 AM Warning: JavaScript 1.6's for-each-in loops are deprecated; consider using ES6 for-of instead Source File: chrome://messenger/content/about-support/init.js Line: 91, Column: 6 Source Code: for each (let [key, value] in Iterator(opt_attributes)) Timestamp: 6/24/2015 2:44:52 AM Warning: Unknown property 'padding-start'. Declaration dropped. 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