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If you close, shut down or exit Thunderbird and it is still running, then you have a shutdown hang. But you shouldn't just report the issue with no additional detailed information, because there are many causes and symptoms for hangs.

So it is To be most helpful , you will want to

* '''obtain a hang stacktrace'''

# Operating system, and version, and Thunderbird version# How often you see the hang (always, rarely, etc)?# Does Thunderbird hang when started in [https://support.mozillamessaging.com/en-US/kb/Safe+Mode safe mode]? If it candoesn't be reproduced hang in safe mode then the problem could be an extension, and you will want to experiment by disabling add-ons until you find the which add-on is causing the problem, then contact the add-on author.

# CPU usage - is usage high (maxed or pegged), zero, low, or other?

#* MS-Windows : in a dos command window, do netstat -a -b -o) - are#* linux, /Mac: do netstat -tp | grep -i thunderbird

''':To recap, you should please concisely report: OS & Thunderbird version, frequency, safe moderesults, cpu, netstat results, indexing on or off, pop or imap account types, sleep/hibernate usage, online/offline usage'''

'''Obtain a hang stacktrace''' - If you can, please :* Get get a stacktrace using _'''hang'''_ instructions in these references. The , then attach stacktrace file can then be attached to a bug report. Anywhere you see "Firefox" in the instructions, please substitute "Thunderbird". ** Windows: [https://developer.mozilla.org/Enen/How_to_get_a_stacktrace_for_a_bug_report How_to_get_a_stacktrace_for_a_bug_reportHow_to_get_a_stacktrace_with_WinDbg]and use '''!analyze -v -hang''' instead of !analyze -v -f** Mac: [[Thunderbird:Testing:Get_A_Debug_Thunderbird_Hang_Stack]]* Linux: [https://developer.mozilla.org/En/How_to_get_a_stacktrace_for_a_bug_report#Alternative_ways_to_get_a_stacktrace]

'''Steps to reproduce''' - Please determine if there is a list of steps (:1. first step, :2. second step, :3. ...) which seem to cause the hang. This would be the things you see and a sequence of steps that occur actions you do just '''before''' you shut down. Often there isn't a single set of steps or a set of steps that cause the hang every time. So you You may need to experiment and test to determine find stepsthat seem reliable. Because it is not always possible But if you can't seem to determine find a unique set of steps, it is important is don't let that stop you from looking at least the bug list or filing a bug report, because the environment information you have all collected from the other details listed list abovemay be sufficient to identify the cause.

Filing a bug : If none of You might check the '''bugs mentioned below''' to see which fit your symptoms, . If none match your symptoms please [https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird file a bug] and include all the information obtained in the steps requested above.

'''All hang bugs: [http://bit.ly/bUY5HM Bugzilla query - open, invalid and fixed bugs from the beginning of time]'''

'''Open hang bugs:'''* sort Click the Status column label of the bugzilla query link above by statusto show bugs in Status order