Users around the globe are reporting, and we have confirmed, that the Windows Phone Marketplace is unavailable. It's been hours now, and users from the US to the UK are unable to download apps or update apps that are already installed. Early on it was believed that all users were affected equally, but many people are reporting that it only applies to NoDo phones (version 7930 and above). The outage also appears to apply to Zune Pass.
Microsoft is aware of the issue but has yet to comment on it. With all of the prior woes associated with NoDo, this is just what Microsoft doesn't need. We will keep you posted as more information comes to light.
Hey, WPCentral users, what's happening amongst the rank and file?
Source: WinRumors Thanks Peter for the tip!
Update: It appears the Marketplace is back in action. We just got a few update notifications that were processed without problem. We aren't sure the Marketplace is up across the board but progress is being made to resolve the issue.