TODAY IS INTERNATIONAL CAPS LOCK DAY, WHICH IS A DAY SET ASIDE TO..(ok thats enough of that). It is a day set aside to celebrate what is normally regarded as bad etiquette, especially when used in emails.
Using ALL CAPS in your emails is widely regarded to mean you are SHOUTING at the recipient. Something which contributed to Vicki Walker of Auckland, New Zealand getting fired.
Vicki would often write her emails and include whole sections in all caps, highlighted in BOLD and Red. In a tribunal Vicki’s employers argued the constant use of all caps in her emails spread “disharmony in her workplace” and justified her dismissal.