Windows Small Business Server 2011 Essentials (SBS 2011 Essentials) is a new, easy-to-use, first-server solution designed and priced especially for small businesses (up to 25 users) that can seamlessly integrate into online services such as Office 365, cloud backup and cloud management solutions. It is expected to release in the first half of 2011.

http://www.microsoft.com/oem/en/products/servers/Pages/sbs_overview.aspx.