Head of Windows web services Antoine Leblond expects interest in desktop PCs to continue to decline, while slates begin to rival laptops in terms of unit sales, TechRadar reports.
"Everything used to be desktops, now 60% of PCs sold are laptops. Next year tablets will outsell desktops," he said during a keynote at the firm's TechEd Europe convention.
Leblond went on to say that tablet devices' touch-screen interfaces are the key to their success.
"Touch is pretty interesting - even five years ago people thought about touch-based cell phones as a niche product," he added. "There are two main devices you don't use touch for - one is your TV, which is fine, and the other is your PC.
"If you think about a tablet, one of the most natural gestures are to just swipe your thumbs across - and you get charms. Very easy, very fast, very fluid."
The executive's remarks follow Microsoft's announcement that it is to take on Apple in the tablet hardware market with the launch of its Surface device.