Microsoft has released Exchange 2007 SP 3.
Now, with Exchange 2007 SP2 we needed to download a special wrapper for SBS 2008 so that the Exchange SP did not break anything.
- Microsoft KB 982423: How to install Exchange Server 2007 SP3 on a computer that is running Windows SBS 2008
When we read through the KB on the new SP, we can see that it is clearly indicated that Exchange 2007 SP3 will install on a production SBS 2008 without needing to do much beyond disabling the Forefront services if present.
Note that the Service Pack should be applied after running the Getting Started Tasks Wizards to avoid complications in IIS on SBS.
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book