We are doing website development and maintenance for a transcription company. Our work also includes SEO for certain keywords relevant to our business, like medical transcription, conference transcription etc. We have a very important keyword called "mp3 transcription". We were in the 1st page for that keyword(in the 4th position) as we had a full optimized page for exactly this keyword. The page is perfectly optimized and the content is original too.

However, when we checked the keyword positions this week, we found that our page has not only dropped from rankings pages, but it has been unindexed by Google!! We have other pages too that are derivatives of this keyword like "mp3 audio transcription" & "mp3 podcast transcription". These have also been unindexed.

We are in the sea regarding this problem and seem to have no answer as to why Google has decided to remove our star pages from its database....