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If you close, shut down or exit Thunderbird (or Thunderbird stops on its own) and you see the Thunderbird '''process''' is still running in MS-Windows task manager (taskmgr) or linux process status (ps), then you have a shutdown hang. An When starthing Thunderbird you may see an error message that "Thunderbird is already running". (But "already running" might not be a hang, so you should check taskgmgr or ps to find whether thunderbird there; if . If you don't see thunderbird listed then you do not have a hang) .

'''What to do:''' 1. Go through the full [[#Symptoms|symptoms]] list below. 2. If you find one of the a [[#Reported Bugs|Reported BugsBug]] is an exact match then cc yourself on the bug, but please only comment if you have new data to add. 3. If no bugs match, then report a new one, and provide detailed symptom information. In summary, just reporting or commenting that you see a hang is not useful - please support your report with symptom data.

Put your answers to these questions in a [https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird bug report ] or in a [httphttps://getsatisfactionsupport.com/mozilla_messagingmozilla.org/topicsproducts/new thunderbird posting to support]:

#* when Windows is started in safe mode? If it doesn't hang in safe mode then something running in Windows is interfering, like antivirus or firewall software. <small>see [[Thunderbird:Testing:Antivirus_Related_Performance_Issues|firewall or antivirus software]]</small>#** [http://windows.microsoft.com/en-us/windows-8/windows-startup-settings-safe-mode win8 safe mode]#** [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 win7 safe mode]#* when Thunderbird is started in [https://support.mozilla.org/en-US/kb/safe-mode safe mode]? If it doesn't hang in safe mode then disable add-ons until you find which add-on is causing the problem, then contact the add-on author.

# Are your What type of mail accounts do you have - pop, imap, or a combination?