The MSDN (Microsoft Developer Network) download site listed all versions of Windows 8 RTM (release to manufacturing), including Windows 8, and Windows Enterprise. The last targets businesses that have volume licensing plans in place.

Two weeks ago, Microsoft announced that , and would be available to MSDN and TechNet subscribers today, Aug. 15. Companies with Software Assurance licensing agreements and members of the Microsoft Partner Network will be able to grab Windows 8 starting tomorrow,

Year-long TechNet subscriptions start at $199, while the least-expensive MSDN subscription -- which lets members access only operating systems -- costs $699.

But Microsoft has also made available the Enterprise edition of Windows 8 RTM to anyone willing to invest some download time.

Although the company said the 90-day trial copy was "intended for developers building Windows 8 apps and IT professionals interested in trying Windows 8 Enterprise on behalf of their organization," those who don't fit into those two categories -- enthusiasts eager to get their hands on the finalized code, say -- aren't blocked from downloading the eval edition.