There are a lot of good document management systems on the market that allow documents to be filed and retrieved a in structured fashion. Often they are time-consuming to use and do not include all emails and documents in one view that can be searched and retrieved simply.
Knowledgemill ensures that all emails and documents are held together in a simple format so that the commentary around the documents is provided in full. Nothing is ever missing due to the automatic filing nature of the technology and you never need to leave the interface that you work in for most of the day – Outlook.