Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
The NNTPSvcInstance entry identifies the instance of the Network News Transfer Protocol (NNTP) server whose virtual directories are indexed by the catalog.
|Range:||1 - 4294967295 (0xFFFFFFFF)|
The NNTPSvcInstance entry is effective only when the value of the IsIndexingIMAPSvc entry is set to one.
Different virtual servers are identified by different values of an NNTPSvcInstance entry.