Upper-Case => Lower Case ...

You just finished writing a text and .... dammit ! Everything is in UPPER-CASE !

Of course, you can delete everything and type it again.

But you can also do the following :
1/ Highlight the text.
2/ Copy it (CTRL + C) and paste it (CTRL + V) in winword.
3/ Press simultaneously SHIFT and F3 keys and your text will be all in lower-case, if you press them again, it will be in lower-case with the first letter of each sentence in upper-case and if you presse them again, the text will be back fully in upper-case.
4/ Highlight again the text and copy it and paste it again in your application.