Neal Patterson, head of the Cerner Corporation in Kansas City, USA, had no idea his private directive to staff would end up being seen by millions of people on the world wide web.
In the three days after the publication of the message, shares in the healthcare software development company plummeted 22% on the stock market.
Empty car park
In the message, originally sent to some 400 managers at the company's headquarters, he complained managers were not working hard enough.
He was particularly angry the staff car park at the company was virtually empty at 0800, suggesting his employees did not like early mornings.
"We are getting less than 40 hours of work from a large number of our KC-based EMPLOYEES. The parking lot is sparsely used at 8am; likewise at 5pm," his message said.
Great expectations
"As managers, you either do not know what your EMPLOYEES are doing or you do not CARE. You have created expectations on the work effort which allowed this to happen inside Cerner, creating a very unhealthy environment. In either case, you have a problem and you will fix it or I will replace you.
"NEVER in my career have I allowed a team which worked for me to think they had a 40-hour job. I have allowed YOU to create a culture which is permitting this. NO LONGER."
He added that "hell would freeze over" before he increased employee benefits. He wanted to see the car park nearly full by 0730 and half-full at weekends.
"You have two weeks. Tick, tock," he said.
Anonymous messenger
Somebody posted his mail sent on 13 March on the Yahoo website eight days later.
Investors who saw it there wondered what was going on at the company, which employs 3,100 employees worldwide.
Mr Patterson attributed his blunt management style to his upbringing in the countryside - adding that one could take the boy off the farm, but one could not take the farm out of the boy.