Microsoft is currently hosting its Build developer's conference, where the tech giant is showing off everything from business plans to virtual reality gear. But the keystone of the event is Windows 10, Microsoft's new operating system, its operating system which will be available on computers for now – but phone users will have to wait a little longer.

During his appearance at a press event at Build, Microsoft's Joe Belfiore explained the company's plans for the launch of Windows 10. "Our phone builds have not been as far along as our PC builds," explained Belfiore. "We're adapting the phone experiences later than we're adding the PC experiences."

The slow mobile development will end up slowing down Microsoft's Windows 10 mobile launch until some point after Windows 10's PC release this summer. "From the device view, our main focus is to kick off the Windows 10 launch wave with a great launch on the PC. You should expect that the other devices – phones, HoloLens, Xbox, Surface Hub – will be staggered, probably not on the same date as the PC," explains Belfiore.

Belfiore also notes that Windows 10 won't have all of its features available upon launch. For example, Microsoft's Edge browser support won't show up until Fall. Similar Microsoft will not have its new messaging app ready until some time after the official release, The Verge reports.

Not that Microsoft has announced the release date yet. "We're on track for this summer, but you should definitely have this notion in mind of Windows as a service," says Belfiore. That notion means that Windows 10 may launch this summer, but there's gonna be a lot of rapid updates, new features, and app changes in the months after launch," notes The Verge.