Tip: Are you a non-native English speaker? I have just finished creating a 
Web AppAfter I published my article about being in/at school, one of my readers asked me about the difference between “in office” and “at office”.
What we would normally say is either “in the office” or “at the office” (notice the definite article). The preposition “in” in “I am in the office” implies that the office is a room and you are inside that room. The word “at”, on the other hand, conveys the general idea of the location of one’s office and is often interchangeable with “at work”. To sum it up:
I am at my/the office. = I am somewhere near my office or in it. I am at work.
“In office” (without an article) means something quite different. We say that someone is “in office” when they work in an official position, usually for the state. For example, we could say:
when referring to his presidential post.
Finally, “at office” (without an article) isn’t common usage. If you feel the urge to say “at office”, say “at the office” instead:
