When using 32-bit Outlook on 64-bit Windows, you must use 32-bit Microsoft ODBC Data source Administrator.
Default Windows path is : C:\Windows\SysWOW64\odbcad32.exe
Windows Vista, Windows 7, Windows 2008 64-bit:
Default Microsoft ODBC Data source Administrator In Administrative Tools (Control Panel->Administrative Tools) will create datasources with 64-bit ODBC drivers, these drivers are not compatible with 32-bit applications!
Windows 8 / Windows 10 64-bit:
In Administrative Tools on a 64-bit Windows 8 / 10 operating system, there are icons for both the 32-bit and 64-bit ODBC Data Source Administrator dialog box.
http://msdn.microsoft.com/en-us/library/ms712362