Microsoft is sending out warning e-mails to distributors that they've activated a new anti-piracy feature in Windows Vista:
"Good afternoon, as of this week, Microsoft has activated a function in Vista called 'Reduced Functionality.' This is a specific function in Vista that effectively disables nongenuine copies of Windows. Therefore anyone who has a pirated copy of Vista will experience:
A black screen after one hour of browsing
No start menu or task bar
Please communicate this antipiracy initiative from Microsoft to your resellers -- note this function has only just been activated in Vista worldwide and therefore any issues with nongenuine versions will start to arise from now onward."