Here are the main points from this....
Microsoft is positioned in the Leader quadrant in Gartner’s Magic Quadrant for Data Warehouse DBMS.
The analysts say that SQL Server 2005 is expected to grow in the data warehouse space.
Microsoft’s vision for SQL Server 2008 makes clear the company’s intent to become a major presence in the data warehouse market.
SQL Server has been leading in Data Warehousing benchmarks by delivering the #1 price/performance for the 3TB TPC-H non-clustered benchmark and the #1 performance result for the 1TB TPC-H
You can find the Gartner Magic Quadrant for Data Warehouse Database Management Systems, 2007 at http://www.microsoft.com/presspass/press/2007/oct07/10-12DWMQPR.mspx