Or OOF, or OOTO or whatever other onomatopoeically ridiculous string of letters you use to let folks know you aren't available for a cubicle chat or call at your desk phone. Apparently, IBM applied for the patent in 2010, which is decades after companies created and deployed these now-commonplace features.
As BoingBoing points out, this patent was granted despite it seemingly flying in the face of the Supreme Court's 2014 decision on Alice Corp v. CLS Bank, which drew a line in the sand declaring some software concepts too abstract to be eligible for patent. (In other words, finally ruling against patent trolls.) If IBM's new one gets re-examined, it'll run aground of the new Alice standard. That's probably why the company is lobbying to change that ruling.
The history of this patent's certification is even worse, in which the examiner first rejected it before IBM counterargued that a statute like Alice wouldn't apply since the patent's method was implemented in computer hardware. That earned Patent 9,547,842 the Electronic Frontier Foundation's Stupid Patent Of The Month award. Congrats.