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Working with Multiple Versions of SQL Server

Updated: 15 September 2007

Microsoft SQL Server 2005 supports multiple instances of the Database Engine, Microsoft SQL Server 2005 Analysis Services (SSAS), and Microsoft SQL Server 2005 Reporting Services (SSRS) on the same computer. You can upgrade previous versions of SQL Server, or install SQL Server 2005 on a computer where previous SQL Server versions are already installed.

You can also run a SQL Server 2000 failover cluster instance in a side-by-side configuration with a SQL Server 2005 failover cluster instance. For more information about side-by-side failover cluster instances of SQL Server, see The Microsoft SQL Server support policy for Microsoft Clustering.

You can install SQL Server 2005 on a computer already running instances of a previous SQL Server version. If a default instance already exists on the computer, SQL Server 2005 will be installed as a named instance.

Important   For SQL Server 2005 installations in side-by-side configurations with previous versions of SQL Server, SQL Server 2005 services must use accounts found only in the global domains group. Additionally, accounts utlized by SQL Server 2005 services must not appear in the local Administrators group. Failure to comply with this guideline will result in unexpected security behavior.

Side-by-side support is as follows:

Side-by-side support SQL Server 2000 (32-bit) SQL Server 2000 (64-bit) SQL Server 2005 (32-bit) SQL Server 2005 (64-bit) IA64 SQL Server 2005 (64-bit) X64

SQL Server 7.0

Yes

No

Yes

No

No

SQL Server 2000 (32-bit)

Yes

No

Yes

No1

Yes

SQL Server 2000 (64-bit)

No

Yes

No

Yes

No

SQL Server 2005 (32-bit)

Yes

No

Yes

No

Yes

SQL Server 2005 (64-bit) IA64

No

Yes

No

Yes

No

SQL Server 2005 (64-bit) X64

Yes

No

Yes

No

Yes

1The 32-bit editions of SQL Server are supported in WOW64 only on the X64 versions of 64-bit operating systems. The 32-bit editions of SQL Server are not supported in WOW64 on the IA64 versions of 64-bit operating systems.

Release History

15 September 2007

Changed content:
  • Added statement of support for running SQL Server 2000 and SQL Server 2005 failover cluster instances in a side-by-side configuration.

12 December 2006

Changed content:
  • Added security guidelines for service accounts in side-by-side configurations.

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