Thunderbird recently did its update to 38.0.1 here in my Win7, and then my Win7 froze almost immediately. I spent the next couple of hours trying re-boots and then even uninstalling and re-installing 38.0.1 more than once and while even also removing profiles and everything Thunderbird in my registry during different tries, yet was never able to get Thunderbird working properly. To resolve my problem for now so I can access my various e-mail accounts, I have reverted to 31.7.0: http://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/latest/win32/en-US/
Does anyone have any thoughts or suggestions as to what might have been going on or wrong?