Heavy editing of the text and Index caused a problem with the Index in Word 2007. Found this when using a large document with over 50 000 words. Troubleshooting solution found...
Trying to eliminate various topics and page numbers from the Index didn't work. When I either updated the Index or added more topics to the Index, all the topics which I thought I had deleted reappeared.
There is a way to delete specific topics from each page from the Index but this is quite involved and beyond the time most writers have to offer when dealing with heavy editing. (See Windows http://office.microsoft.com/en-us/word/HP012264991033.aspx#4 )
I deleted from the Index the unwanted topics and / or page numbers and save the doc as is. This solved the problem of the reader not having to see these old unwanted topics in the Index. Be careful not to update or add to the Index! These unwanted details didn’t appear in the Index after it was published.
They were still there in the background unseen, but weren’t visible to the reader, hence causing no confusion.
The large document was one I wrote called the School Marketing Manual for the Digital Age (3rd ed) 2010 by Bryan Foster.
Troubleshooting for when the reader has to see all the old unwanted Index topics and / or numbers, save time by not laboriously deleting individual topics and / or pages from the Index, as per Windows suggestions above, just delete from the Index and save the doc – but don’t update the Index at the final stage.