 Microsoft altered SPP significantly in Windows Vista Service Pack 1.Instead of the reduced-functionality mode, installations of Vista left unactivated for 30 days present users with a nag screen which prompts them to activate the operating system when they log in, change the desktop to a solid black colour every hour, and periodically use notification balloons to warn users about software counterfeiting.In addition, updates classified as optional are not available to unactivated copies of Vista.