Sony Ericsson’s chief executive officer has revealed he feels Windows Phone “isn’t as good” as Android.

Sony Ericsson CEO Bert Nordberg made his feelings clear in an interview with The Wall Street Journal, published on Monday. The Next Web notes that Nordberg responded to a question on Sony Ericsson’s rivals willingness to adopt other phone operating systems. “At this point I wouldn’t feel comfortable investing in a platform that isn’t as good as the one that we currently use,” said Nordberg. “Therefore we have remained with Android, but I am quite curious about Windows Phone.”

Sony Ericsson had originally promised to unveil a Windows Phone handset in 2011. The company revealed in October 2010 that it was planning to launch Windows Phone 7 devices this year. Microsoft also named Sony Ericsson as a launch partner when it first unveiled Windows Phone 7 at Mobile World Congress in early 2010. At the time of writing, Sony Ericsson has yet to announce any plans for a Windows Phone 7 device. It has since been reported that the pair could not reach an agreement around Microsoft’s Xbox LIVE integration in its operating system. Microsoft curiously registered the and domain names recently. Both domains were registered to Microsoft through Corporation Service Company (CSC), a corporate identity protection firm.

A number of images of prototype Sony Ericsson Windows Phone 7 devices emerged earlier this year. Sony Ericsson had originally planned to launch a 4″ screen device featuring a QWERTY slide-out keyboard. The project was subsequently scrapped but recent rumors suggest that Sony Ericsson may be planning a Windows Phone 7 device later this year. The leaked device, featured below, could hint at Sony’s possible form factor for a future Windows Phone device. Sony Ericsson is a join venture between Sony’s main consumer electronics company and the Swedish telecommunications company Ericsson.