I’m a bit late to catch on to this one, but earlier this month Microsoft (finally) released WHS for download on MSDN. From the official announcement on the team blog:

MSDN availability will increase awareness of Windows Home Server with a larger community of professional developers and help further grow the ecosystem of software applications built for Windows Home Server.

Well, it’s about bloody time! There’s been a fair bit of public scrutiny over MS’s expectation for third party developers to write addons given that they had not released this earlier. I’m really looking forward to getting my server back up and running again after a much neglected Server 2008 installation.