Grab the preview release at the link below, and check out the new feature list here. Windows 8.1 releases later this week as part of the BUILD Developer conference.
Windows Server 2012 R2 Preview Available For Download
About the Author
Angus Kidman | Lifehacker Editor
Angus has been writing professionally about technology since 1994 and breaking it for even longer. He is based in Sydney but spends a frankly unhealthy portion of his life on the road, tracking down the latest stories. In 2011, he won the IT Journo Award For Best Consumer Technology Journalist and Consensus IT Writers Award for Best Technical Writer for his work on Lifehacker; about time too.