Here are some intresting links to research and studies showing the growth rate of SQL Server 2005/2008 in RDBMS market.
SQL Server 2005 is the Data Platform leader
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SQL Server is the fastest growing Database and Business Intelligence vendor
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SQL Server ships more units than Oracle and IBM combined.
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SQL Server is the #1 OLAP Server on the market.
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SQL Server is more secure than Oracle. Since July 2003 more than 100 critical Oracle database security vulnerabilities have been identified, compared to ZERO for SQL Server for that period.
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SQL Server is best in price/performance for TPC-H 1TB & 3TB (non-clustered).
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Microsoft SQL Server and Unisys are the first to publish TPC-E benchmark results.
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Gartner 2006 worldwide RDBMS market share reports highest growth rate in market share for Microsoft SQL Server. With 28% growth in market share, growth is almost twice the nearest competitor at 14.8% growth.

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