Canmove, confirm
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#* when started in [https://support.mozillamessaging.com/en-US/kb/Safe+Mode safe mode]? If it doesn't hang in safe mode you will want to disable add-ons until you find which add-on is causing the problem, then contact the add-on author.
#** happen without calendar/lightning extension? ({{Bug|532435}})
#** happen without enigmail extension? ({{Bug|533464}}
#* with [[Thunderbird:Testing:Antivirus_Related_Performance_Issues|firewall or antivirus software]] disabled? If it does not, then the problem is with that software, not Thunderbird.
# Is gloda indexing enabled or disabled? (Tools|Options|Advanced|General)
