Hello,

15+ year Thunderbird user. Six email accounts and more than a decade of emails. Starting today, changing nothing (to my knowledge), Thunderbird will not open even far enough to show an inbox. It immediately hangs and my hard drive goes wild. The Activity Monitor App showed as high as 121% CPU usage. MacBook Pro (2016) OS High Sierra 10.13.6. After multiple web searches, I have uninstalled Firefox (no dice), and done a fresh install of Thunderbird (twice. no dice). I also updated (after these issues, in an attempt to fix them) from OS Sierra to High Sierra (no dice). I most certainly don't have the time or willpower to build a new profile and move everything. So, if I can't rectify this simply and quickly, I'll just move on. However, I really just want it fixed. Thank you.