A few important notes about Windows 7 Enterprise Edition 90-Day Trial version is that after the expiry of 90 days evaluation period, IT Pros who wish to continue to use Windows 7 Enterprise will be required to purchase and perform a clean installation of Windows 7, including drivers
and applications, officially. User supposedly cannot enter a new key to extend the usage period or convert it to production version, as it’s evaluation-only copy. But in Windows 7, it’s pretty easy to change product key
to perform new activation, after purchasing a genuine VL MAK key.