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Shutdown hangs, where Thunderbird is still running after shut down, do not all have the same cause, even different hangs on the same OS. To determine why it is hanging it is helpful to describe what is running in the environment, a stacktrace, and a list of steps to reproduce. This may require some experimentation testing on your part, and we know this is not always possible. But it is important to provide as much of the needed information as you can, and state how often you see the hang (always, rarely, etc).
Also, when describing your hang, the answers to the following these easy questions helps identify the type of hang:
# If the problem is reproducible and you have add-ons/extensions installed, does the hang happen with Thunderbird started in [https://support.mozillamessaging.com/en-US/kb/Safe+Mode safe mode]? If it can't be reproduced in safe mode then the problem could be an extension. Experiment by disabling add-ons until you find the cause, and contact the add-on author.
#* does hang happen without calendar/lightning extension? ({{Bug|532435}})
