I despise writing style with all words put in capital letters, esp. in an email. it's very rude, looks like the writer's shouting to the other party. well, unless that is exactly the intention. even worse if the person write it in bold font with red color.

another style is mixed case, some are in upper and the rest in lower case, in random order depending on the writer's mood. for example: i tHInK tHiS iS rEAlLy cUtE. hmph. it's totally not cute, unprofessional and looks like the writer doesn't have anything better to do.

I also hate reading emails with lots and lots of question and exclamation marks. It's like implicitly saying that the reader is too stupid to notice one mark.

*a grumble before end of the year*