Searching for an email archiving software - similar to Open Benno

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http://www.linuxquestions.org – Hello, I'm searching for a software, pretty much like Open Benno http://www.openbenno.org But it seems as this project is dead (no mailinglists anymore, no news since 2010, ...) Is there an alternative? I'd like to have all my emails from free mailers and private mail servers in one huge searchable software that I can access easily from a browser. Thanks, Chris (HowTos)