Practical research applications (Score 2, Interesting)

I do data mining research, most recently on the Enron email dataset, and I've actually been having to roll my own multi-mailbox storage, access, and retrieval systems. It's taking way more time than I'd like, at this point I've gotten a database and web-based viewers made up (beware, they're quite slow).

If anyone has an idea of an open-source application similar to what the submitter is looking for, it would help my research quite a bit. There's practical research applications in this stuff, if someone's interested in making it.