Although by default the Windows operating system can run for free for 30 days ( extendable to 120 days with rearm) as evaluation or trial period, however without proper activation, end-users will be kept reminded with frequent messages to activate the system, and the system may be unusable if not activated post activation-free period expiry date. All versions and editions of Windows 7 and Windows Vista has to be activated, including copies of Windows 7 and Windows Vista licenses acquired through either retail or volume licensing channels.
