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No. &nbsp;You can install a separate instance of SQL 2008.
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Hi<br />
<br />
I have MS SQL 2005 EXPRESS AND SSMS 2005 on my desktop.<br />
<br />
I want to install MS SQL 2008 EXPRESS and SSMS 2008. Do I need to uninstall the 2005 version?
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Hi

I have MS SQL 2005 EXPRESS AND SSMS 2005 on my desktop.

I want to install MS SQL 2008 EXPRESS and SSMS 2008. Do I need to uninstall the 2005 version?

Install MS SQL 2008 express.

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.

Microsoft SQL Server 2008

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.