9. The server of claim 8 wherein the phrase analysis engine further comprises a correlater configured to add to the single group of documents, those documents with a similar statistically improbable phrase.
8. A server comprising: a processing device; a memory coupled to the processing device, the memory storing a corpus of documents; and a phrase analysis engine executable from the memory by the processing device, the phrase analysis engine comprising: a parser configured to parse each document of the corpus of documents to determine phrases found in each of the documents; an analyzer configured to: analyze each determined phrase with respect to each document to determine a frequency of occurrence of the phrase in the document relative to a frequency of occurrence of the phrase in the corpus; and identify documents that comprise a same statistically improbable phrase, wherein the statistically improbably phrase is one of the determined phrases having both of: a probability of occurrence in a document of the corpus of documents that is higher than probability of occurrence of other phrases in the document; and a probability of occurrence in the corpus of documents that is lower than probability of occurrence of other phrases in the corpus of documents; and a categorizer configured to group the identified documents that comprise the statistically improbable phrase into a single group of documents.