The show is owned by NBCUniversal, which has a deal with Netflix allowing viewers to binge watch the entire series until 2021. NBCUniversal is launching their own streaming service next year that is expected to rival Netflix and is considering using "The Office" as their service's main draw to get subscribers. This would leave Netflix and its viewers out of the picture.
Netflix responded to the report in a tweet saying, "Hello it's me with your regularly scheduled reminder that The Office will be on Netflix until 2021 — at least!"