Canmove, confirm
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add firewall software
# 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 add-on causing the problem, and contact the add-on author.
#* does hang happen without calendar/lightning extension? ({{Bug|532435}})
# what firewall software do you run, if any?
# cpu usage - is usage high (pegged), zero, low, or other?
# run netstat -a -b -o | grep -i thunderbird (in MS-Windows in a dos command window do netstat -a -b -o) - are connections shown from thunderbird to ldap, imap mail server, or other protocols?
