For the oil industry, Yahoo Inc’s decision this week to sell its core business to Verizon Communications Inc for $4.8 billion does not matter all that much. Their world already changed a few months ago, when the company said it would jettison its messaging system that has been the norm for oil traders since the late 1990s.

Back then, Yahoo’s technology revolutionized the industry, helping usher in a new era of high-speed communication that changed the way millions of barrels of oil traded daily. For Gene Grabinski, who was trading crude in Chicago for BP Plc, one of the largest energy companies in the world, it was just the solution needed to stem the endless flood of phone calls, Reuters reports.

And it came about only because he saw his young daughters using messaging services back in the late 1990s.

Come Aug. 5, Yahoo is scuttling its legacy instant messaging service as it seeks to move users to its new Messenger platform, which traders will not use because it fails to meet the industry’s compliance standards. The announcement was made in June, prior to the Verizon deal. A company spokeswoman said that Yahoo will focus efforts on its new system, which will deliver better personal communication experiences to its users.

For almost two decades, tens of thousands in the oil industry relied on the old Yahoo Messenger system, which launched in 1998. At that time, Grabinski was one of just two traders responsible for trading physical, domestic crude for BP, which owns some of the nation’s biggest refineries including its facility in Whiting, Indiana, and previously Texas City, Texas.

But Grabinski had a problem. Every day, his phone “looked like a Christmas tree,” he said, with red and green lights blinking as a flood of brokers called and were put on hold while Grabinski tried to gather market prices.

After seeing his younger daughters, 11 and 7, use online instant messaging to chat with friends, he figured he could use the same system at work at the British major.

It is not clear how Yahoo took the industry by storm, but Grabinski was part of the first wave of oil traders to use Yahoo instant messaging, having opened his account just a year after it was launched.

Now, yet, all the industry has to go elsewhere.

And Grabinski said the transition to a new system should not be a problem.

“Change is part of it, and you kind of just move on,” he said. “I don’t think it’s going to be that hard. You just type into a little box.”