With more clients and servers going 64bit, if you are troubleshooting ODBC issues on Clients or Servers running 64-bit operating systems (especially with 32bit apps) then you may need to check the 32bit version of ODBC Data Source Administrator to see the appropriate DSNs: According to Microsoft ( http://support.microsoft.com/kb/942976/en-us ): The 32-bit version of the [...]