SEATTLE (Reuters): Revealing its price tag for the first time, Microsoft Corp will sell a bigger version of its new, wall-mounted video-conferencing and digital whiteboard device for $20,000, making it the most expensive product in its hardware line-up, the software company said on Wednesday. Orders start July 1 for the Surface Hub, which Microsoft hopes will become a fixture in meeting rooms around the world. It will run a custom version of Windows 10, Microsoft’s new operating system due out in late July. Deliveries will start in September. Despite the hefty price tag, Microsoft is betting that the Surface Hub will appeal to businesses that are used to spending multiples of that amount on conference room facilities.