How to install Exchange Server 2007 Service Pack 2 on SBS & EBS 2008
BEFORE installing Exchange SP2 on your EBS network, read the KB article and the EBS Official Blog post! :-)
For SBS, check out the SBS Official Blog post.
Until you hear otherwise from Microsoft, do not install Exchange 2007 SP2 on EBS or SBS without following the guidance on their respective blogs and the KB articles.