"Four years ago, we committed to building an infrastructure solution for the mid-market. Windows Essential Business Server (EBS) which was the first of its kind to meet the unique needs of mid-market IT pros. Since that time the market landscape has naturally changed.
Today, we announced the decision to streamline our server product portfolio and will discontinue future development of EBS, effective June 30th, 2010."
Source: http://blogs.technet.com/essentialbusinessserver/default.aspx