Microsoft has released a new build of its forthcoming release of Windows Server, code-named Longhorn.

The company posted the release, which is the December Community Technology Preview (CTP) of the server OS, on its Microsoft Connect site, according to a posting on MSBlog.

Microsoft's CTP programme is designed to give users early and frequent updates to forthcoming Microsoft technologies.

Only participants of the Longhorn beta programme can access the new build, which Microsoft has called 6001.16406.

Longhorn will feature built-in virtualization technology, as well as better management, security and administration features, Microsoft has said. The company plans to release the final version of Longhorn in the second half of 2007.