Now that, Exchange 2007 SP2  is released. As Windows Essential Business Server (EBS) 2008 integrates Exchange 2007, this SP2 is also applicable for Windows EBS. To install SP2 on EBS, you must read through the following bullet points prior to take action:

·Install SP2 on all Windows 3 EBS 2008 servers, including Management Server, Security Server, and Messaging Server (the order of the install is not important).
·Disable Forefront Security for Exchange on Windows EBS Messaging Server before you launch Exchange 2007 SP2 setup program (see below)
·Complete the installation of Microsoft Exchange 2007 Service Pack 2
·Enable Forefront Security for Exchange after successful installation
·For more details see KB973461. Read here the whole process to get Exchange 2007 SP2 deployed on Windows EBS 2008.