The push towards Windows 2000 follows a disappointing start for the system, which at a server level will be the next step for NT users.
One IT director claimed there were plenty of large firms using NT that had not made the move to Windows 2000 and still needed training on the platform.
His claims that training courses were being cut back were backed up by industry sources who admitted that they were beginning to be killed off.
Ian Turner, director of Key Training, said NT courses were already stopping or winding down as users were pushed towards Windows 2000.
"We had a rush of NT demand late last year but that demand has rapidly tapered away. We have already stopped offering courses and are seeing a healthy increase in Windows 2000," he said.
Simon Derry, managing director at TrainingBridge.com, said it would stop providing NT training at the end of the year.
"We can't see demand going on beyond that," he added.
"I would be surprised if firms using NT did not take advantage of training at some point this year."
A further source claimed it was in Microsoft's interests to push people towards Windows 2000: "It has created a heavy roll towards 2000 and anything that drops NT in the mire will be good news [for Microsoft]."
Sarah Foxall, Microsoft skills manager, said it had to keep up with emerging products and change its exams to offer support for Windows 2000.
"To ensure the credentials of the Microsoft certified programme (MCP) remain valuable, it is important that they are considered to be up to date on the most advanced, mainstream technology available," she said, adding that IT directors needed to get staff trained in Windows 2000.