MS products are more complicated as they have developed programs specifically as Word Processers to perform a whole raft of more complicated processes.

For just about any program you can use the following. But it is used in Thunderbird which as a more basic text/composing editor as it's only dealing with composing emails and not complex word processing.

Hold down 'Shift' key and press eg: 'A' key to shift from lower case 'a' to upper case 'A'. Release the 'Shift' key to revert back to lower case. OR select the 'Caps Lock' key to fully swap between lower and upper - if typing more than one capital letter. You usually notice a light switch becomes enabled on the keyboard to remind you that 'Caps Lock' has been enabled.

In Thunderbird, the F3 key is used to open a 'Find in page' type of search. Here is a link to many Thunderbird shortcut keys.

• https://support.mozilla.org/en-US/kb/keyboard-shortcuts-thunderbird

If you have typed some text in an email but then want to change maybe a word from lower to upper case then you would need to use an addon called 'unicodify-text-transformer'

The person (author) who developed the addon is responsible for the addon - not Thunderbird. Always check that the addon has been updated to work with the version of Thunderbird you wish to use.

• https://services.addons.thunderbird.net/eN-US/thunderbird/addon/unicodify-text-transformer/

How to install an addon:

• https://support.mozilla.org/en-US/kb/installing-addon-thunderbird