E-mail is the 'flow' in the work flow of many people. Consequently, one spends a lot of time searching for old e-mails, to dig up some important piece of information. With people having tens of thousands of e-mails (or more), this is becoming harder and harder. How to find that one e-mail in an evergrowing haystack?

Enter mu.

'mu' is a set of command-line tools for Linux/Unix that enable you to quickly find the e-mails you are looking for, assuming that you store your e-mails in Maildirs (e-mail directories).