The story of how one program has spoiled the life of 740 mail employees.

Employees of the British Post Office Ltd. Over the past 20 years, it was risked to be behind bars or at least without housing and livelihood due to errors in software.

POST Office used Horizon specialized software owned by Japanese Fujitsus, with a critical error in the code. It was led by the wrong calculations and regularly showed major shortages. The company was confident that Horizon works flawlessly and post office managers. Post Office then attributed shortage of branch staff.

In total from 2000 to 2014, almost 740 post office staff were brought to criminal liability: some of them were in prison, someone lost their personal savings and housing in an attempt to cover the shortage, somehow separated from children, and one of the employees She committed suicide when it became known that he was allegedly involved in the stealing of one hundred thousand pounds.

On April 23, 2021, the Royal Court of London issued 39 acquittal sentences in relation to POST Office employees. Earlier, all of them were mistakenly convicted for theft of money from the company — someone paid out dismissal, and someone is freedom.