Upgrading to SQL Server 2008
You can upgrade instances of SQL Server 2000 or SQL Server 2005 to SQL Server 2008. Before running SQL Server Setup to upgrade to SQL Server 2008, review the following topics about the upgrade process.
Documents installation requirements, system configuration checks run by SQL Server Setup, and security considerations for a SQL Server installation.
Documents supported upgrade paths to SQL Server 2008.
Describes Upgrade Advisor, a tool that analyzes instances of SQL Server 2000 and SQL Server 2005 to identify known upgrade issues.
Provides links to procedural topics for upgrading to SQL Server 2008.
Lists the significant changes that might affect your applications after you upgrade to SQL Server 2008.