The Office can be good for learning English if you already understand everyday conversations and want more consistent practice. Some conversations move quickly, so learners may need to listen to certain parts more than once at first. Learners will hear plenty of useful natural English, but some lines may still require a second listen. The storyline is easy to follow, so missing a few words should not stop learners from understanding what is happening. It should work best near B1/B2, especially for learners prepared to handle faster dialogue.