The company will rely instead on its so-called Community Technology Previews (CTPs) to allow developers to test the software.
The cancellation is not the only promise that Microsoft has broken leading up to the release of the final Vista code later this year, as the CTPs will not now be released on a monthly basis.
CTPs for November and January have been skipped, and the next release is scheduled for February.
Microsoft unveiled the first beta of Vista in July and has published CTPs in September, October and December.
A CTP is an interim test release of software that aims to provide Microsoft with additional feedback.
Although the process has not been used for releases of Microsoft's operating systems, the company claims that it leads to better quality and ease of use.
Molybdenum ditelluride is a two-dimensional material that can be easily stacked into multiple layers to create a memory cell
New light-guiding nanoscale device can control and monitor a nanoparticle trapped in a laser beam with high sensitivity
Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime
The observations were made using the Atacama Array in the Chilean desert