The technology, called FlexGo, will be used as part of efforts to sell computers to lower-income consumers in developing countries, where Microsoft is eager to find new money-making opportunities but is battling software piracy and other barriers.

Redmond-based Microsoft, working with computer maker Lenovo Group Ltd. and others, plans to launch a second trial of the FlexGo plan in Brazil beginning Monday. In the next 90 days, it will launch in Mexico, China, Russia and India.

The program will generally work like this: a user will pay for about half the cost of the computer upfront, and then will purchase pre-paid cards to get hourly access to the computer at home. If the pre-paid card runs out and the user doesn't buy more hours, the computer stops working until the user buys another card.

The pre-paid hours will go toward paying off the computer, said Will Poole, a senior vice president in charge of Microsoft's market expansion group. The financing models and interest rates will vary depending on the market, so he couldn't say how much more than the retail price the user will end up paying.

The users will need at least occasional dial-up Internet access to participate in the program. It will initially feature mid-range PCs running the consumer version of Microsoft's Windows operating system. But Poole said it also may eventually include other models, such as those using Microsoft's scaled-back Windows XP Starter Edition or higher-end ones running a media-centric version of Windows.

Microsoft also will work with telecommunication companies in several countries to offer computers via subscription.

Microsoft will make the same amount of money off these models as it does with traditional sales, Poole said.

FlexGo is one of several ways Microsoft has tried in recent years to make more money in emerging markets, where it sees potential to increase revenue as more developed markets for Windows grow saturated.