I've been in the belief that we shouldn't capitalize the prepositions in titles or abbreviations until I started working in a company, where most of the colleagues are American.
When they say "Out of office," they type "OOO" instead of "OoO," and "WFH" (for "Work from home") instead of "WfH."
Am I wrong, or are they wrong? Should I stick with my weird "OoO" or conform?