Soon you’ll notice that the SBS 2008 media will now include Windows Server 2008 Service Pack 2. This change’ll help improve the reliability of the newly deployed SBS servers, while at the same time, providing savings in terms of deployment time. Other updates included with this release: •OneCare for Small Business trial version is no longer included. Setup options and integration have been removed. •Since the original launch of SBS 2008, the OneCare line of products has been replaced by Microsoft Security Essentials. This is a free download that is not designed for business environments, we will keep you posted on any future options for your SBS environment. •New Migration Preparation Tool (SourceTool). •In Join Domain (Migration) setup scenarios, the SBS 2008 setup will pause if it has detected that the Source Tool has not been completed successfully on the domain being joined.
More info: SBS blog