Note 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 IMAPSvcInstance entry is the instance number of the Internet Mail Access Protocol (IMAP) virtual server that contains virtual roots to index.
|Range:||1 - 4294967295 (0xFFFFFFFF)|
The value of the IMAPSvcInstance entry applies only to virtual mail servers of IIS and only if the value of the IsIndexingIMAPSvc entry is set to one.
Build date: 9/10/2012