Microsoft and Nokia are preparing to launch the new Windows phone device tomorrow, as analysts predict a make-or-break moment for the device.

The timing of the release is close to the expected launch time of the new iPhone of September 12th, which could threaten to steal the limelight away from the Windows phone.

Ben Wood, director of research at CCS Insight, said "If it fails to get that reaction at the time of the announcement that does not bode well for the future of the portfolio."