Windows Enterprise ISO images are freely available copies of Windows, which work for a limited time (~90 days). To get one of these ISO files, go to the Microsoft Evaluation Centre. You need to provide:

① First Name*

② Last Name*

③ Email*

④ Company Name* 

⑤ Country/Region*

⑥ Company Size*

⑦ Job Role*

⑧ Phone*

⑨ (optional) Questions/Comments Field 

* Feilds are Required 

They are meant for evaluating and testing different enterprise configurations. It’s good if you need a clean install of windows to test software to see if there’s any issues before commiting to a full deployment. That and – one time my Windows machine died during tax season and I just needed to open QuickBooks. It was great for that.