Try this: https://addons.mozilla.org/en-US/thunderbird/addon/titlecase-for-thunderbird/ [http://xenos-email-notes.simplesite.com/416814616 How to install add-ons]

''adge115 [[#question-1062751|said]]'' <blockquote> Often type with Caps Lock on when I do not mean to; or vice versa. Rather than retype would be great to select words and then change case as in MSWORD. Upper -> Lower and vice Versa + Capitalize word function </blockquote> '''This 'Add on ' is excellent. ''' Suggest perhaps the tool should not exit immediately as would then allow a degree of inspection for the best display. ie Upper or Lower or Camel. Once happy then press an Exit button. Minor comment and I'm sure others might disagree. Once integrated into TB then other users could offer other or better suggestions.