Microsoft is working to bring Windows 10 to the market later this year, and although everyone sees the new OS as a turning point for the Redmond-based software giant in the software industry, there's at least one analyst who thinks that Windows is expected to decline despite the arrival of a new version.

Technalysis analyst Bob O'Donnell estimates that Windows will drop from more than 90.4 percent in the desktop market last year to around 88.7 percent this year, citing the growth of Apple's and Google's platforms as the main reason.

According to his forecast, Apple is expected to get at least 6.9 percent of the PC market this year, up from 6.2 percent in 2014, while Chrome OS should increase to 2.9 percent from 2.2 percent last year.

If this is true, Microsoft has every reason to be worried, especially because a decline in the eve of a new Windows launch is clearly a sign that interest in its desktop platform is dropping too.

But fortunately, that's not going to happen, most people believe, especially because Windows still holds more than 90 percent of the market and the arrival of Windows 10 would make working on PCs faster and more effective for both consumers and enterprise users.

Windows 10 is expected to arrive in the fall of 2015, most likely before the back-to-school season, so Microsoft should be able to benefit from the strong demand during that time to boost sales of its OS and devices running it.