When does The Office return?

The Office is an American mockumentary sitcom television series based on the 2001–2003 BBC series of the same name. Adapted for NBC by Greg Daniels, a veteran writer for Saturday Night Live, King of the Hill, and The Simpsons, the show aired from March 24, 2005, to May 16, 2013, with a total of nine seasons consisting of 201 episodes. The Office received moderately positive reviews from critics during its short first season, but the following seasons, particularly Carell's performance, received significant acclaim from television critics as the show's characters, content, structure, and tone diverged considerably from the original British series.
The show is a mockumentary based in a branch of a large paper company called Wernham Hogg in the Slough Trading Estate in Berkshire. The office is headed by general manager David Brent (Gervais), aided by his team leader and Assistant to the Regional Manager Gareth Keenan.