http://support.Microsoft.com/kb/923432/

SYMPTOMS

The initial release media for Microsoft Windows Small Business Server 2003 R2 contains the wrong version of Microsoft Exchange Server 2003 Service Pack 2 (SP2). This update installs the correct version of the affected Exchange Server 2003 SP2 files.
Different versions for some of these files can be found in other folders on the server. For this update, only the installation folders in the following table apply.
Note This update applies to you if the version level of any of the following files is 06.05.7638.1. This update does not apply to you if the version level of all the following files is 06.05.7638.2.

 

http://support.microsoft.com/kb/924000/en-us

This article describes the steps that you must take to upgrade the initial release media of Microsoft Windows Small Business Server 2003 R2 (Windows SBS 2003 R2) to include the final release version of Microsoft SQL Server 2005 Workgroup Edition

ttfn

David