Tasked with a very large email conversion project and lost

Im not sure where to start or what to even consider using for the following problem.

I have a Lotus Notes infrastructure with many user mail f开发者_JAVA技巧iles that I need extracted and stored into another format/database such as sql. After the conversion I need to find a way to index all of the emails, while maintaining, from, to, subject, and content, attachments are not important. I need some way to search for all emails containing a keyword or context, regardless of sender, and pulling them all in a displayable search form in order of date. Does anyone know what may help my situation?

software that does what you want is called E-mail_archiving, there are many products, and for example you could try an open source one, http://www.mailarchiva.com/index.do

If mailarchiva does not import natively nsf files, you just have to convert them to a format they support.