Version 2008 R2, available in 32bit and 64bit, currently at "Service Pack 2"
Version number should read 10.50.4000.0
Updated installation package is at http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26729
Comparison to "full" versions (directlink to PDF): http://download.microsoft.com/download/F/F/C/FFC6D450-A0A2-4916-80EA-B83F7BCDF25/SQLServer2008R2EditionsDatasheet_Aug10%5B1%5D.pdf
Old test results
The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
Microsoft SQL Server Management Studio Express 2008 installer fails (some .NET assemblies are not updated/patched by .NET service packs containing .msp)