Welcome to the Windows 7 Enterprise 90-day Trial. It is designed specifically for IT Professionals, so that you can test your software and hardware on a final version of the product. In addition, it provides the opportunity for you to become more familiar with the key improvements over previous versions of the Windows operating system, and experience firsthand how Windows 7 can make your PC environment more productive, secure, and manageable.
Guidelines on usage:
NOTE – pay particular attention to the bullet that explains what happens after the 90 days is up. This trial cannot be upgraded to production with another key. In other words, a complete re-install will be necessary.
Get the trial at http://technet.microsoft.com/en-us/evalcenter/cc442495.aspx.