Many mainstream users have accumulated large email repositories, egged on by free and ubiquitous service providers exhorting them to “Never delete anything!” Over a lifetime, many of these users can expect to accumulate 50 years or more worth of email archives. Unlike blogging or keeping a diary or journal, email silently captures our experiences and thoughts, virtually every day, week, month, or year, in situ, as they come up in our communication. Unlike most other life-logging techniques, email already has a large user base with a large volume of data, that can be used for experiments. We have implemented an exploratory email mining tool called Dunbar to understand challenges in life-browsing with a large corpus of email. Based on our experience so far, we outline several research questions in email mining that need to be addressed.