(From my research, Index Server no longer exists on Win2012 -- If this is mistaken, tell me how to set it up!)
Moving a nice .asp application from Win2003 server to Win2
use Provider=Search.CollatorDSO;Extended Properties='Application=Windows';
as connectionstring.
After lots of digging around, the answer has been found.
Downloading and installing Windows Search Server does not install the OLE DB provider. Neither does installing the Windows SDK. The provider is installed when the Windows Search Service is installed.
On Win7/8 desktop OS, this is installed by default (I believe). On server, you have to enable the feature.