You will need to re-enable add-ons one at a time until you locate the offender.

If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. On the Help menu, click on 'Restart with Add-ons Disabled'. Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode).To diagnose problems with Thunderbird, try one of the following: So do I close this topic as solved? If not try the following Most people asking to go back simply need to restart So you have solved your problem by installing emclient. You might want to actually elucidate in your question (by editing it, not replying to yourself) what it is you are trying to achieve. Just be aware this latest version makes going back with your profile data hard.

I suggest you use Google to locate some of the hundreds of previous responses. Please note I have answered questions on where to download a older version probably more than a thousand times in this forum, so I will not be answering you. You have NOT contributed to a solution here at all. If the information in this topic does not help you, I suggest you move on to one that does contain useful information to you.

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