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SQL Server 2008
Getting Started
 Working with Multiple Versions and ...
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SQL Server 2008 Books Online (October 2008)
Working with Multiple Versions and Instances of SQL Server

SQL Server supports multiple instances of the Database Engine, Analysis Services, and Reporting Services on the same computer. You can also upgrade earlier versions of SQL Server, or install SQL Server on a computer where earlier SQL Server versions are already installed. For supported upgrade scenarios, see Version and Edition Upgrades.

You can install SQL Server on a computer that is already running instances of an earlier SQL Server version. If a default instance already exists on the computer, SQL Server must be installed as a named instance.

The following table shows side-by-side support for SQL Server 2008:

Existing instance of SQL Server 2008 Side-by-side support

SQL Server 2008 (32-bit)

SQL Server 2000 (32-bit)

SQL Server 2000 (64-bit) x64

SQL Server 2005 (32-bit)

SQL Server 2005 (64-bit) x64

SQL Server 2008 (64-bit) IA64

SQL Server 2005 (64-bit) IA64

SQL Server 2008 (64-bit) x64

SQL Server 2000 (32-bit)

SQL Server 2000 (64-bit) x64

SQL Server 2005 (32-bit)

SQL Server 2005 (64-bit) x64

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