What are the common weaknesses of a office manager?

Answer 1

If you mean getting revenge on a bad manager, they usually have control problems so you can make something move that affects them but they cannot control (and doesn't involve you!) and watch their head spin

If, more simply, you're a manager looking at how you can improve, then look towards your listening skills. I've never met a manager who fully understands what people say to them and couldn't benefit from trying to do so. Learn the NLP methods of 'chunking' up / down and horizontally, for a surefire way to ask the right questions to get the information you need. Never assume you understood the simplest of conversations, especially if your subordinate started it.

Get yourself some empathy, model the behaviours of the people you lead until you feel you must understand them. Be reasonable, absorb or fight the pressures that come from above and ensure that the image of the company as a reasonable place to work is entirely in your hands. In doing so, you must master emotional control to a level far beyond your subordinates. This acting is your skill, in the same way that pressing those buttons on the printing press or editing those documents is your teams skill.

There's so much more to it. You basically have to understand people and keep all of those above and below in the belief that they're getting what they want. If you can do that without lying, then you stand a chance of keeping your own soul happy in the process. Good luck.