According to Collider, in the new book "Office: an uncomplicated story of the greatest Sitkom 2000-x" reveals the true reason why Steve Karell decided to leave the office before the series was closed. When writing a book, the authors took an interview with the TV show's sound operator Brian Whittle, who told the following:
Once I sat next to Karel, and he explained to me what was the case. Prior to that, he gave an interview on the radio and accidentally, almost unconsciously mentioned that the seventh season could be the last for him. He did not plan to talk about this hearing. Moreover, the final decision he has not yet accepted by that time. But when he voiced it, then the other people involved in the show did not respond in any way. They did not raise the noise and did not say: "What? Do you want to leave?" He said that they did not follow any response ... when it turned out that he would think about leaving, none of the bosses of the show did not bother to keep him in the cast.
Barber-stylist Kim Ferri confirmed this information, told the same story: when Carnell's current contract came to an end, the leadership of the NBC television channel did not offer the actor a new deal. The director of Casting Ellison added to this:
How much I remember, he [Carll] was going to be held in another season, but NBC for some reason did not renew the contract with him ... Someone was underponging him. It was all so stupid. I do not even know how to say about it. Just stupid.
Recall, the Character of Karella named Michael Scott was one of the symbols of the "office", but he was removed from the plot in the seventh season. Tele show went on screens from 2005 to 2013.