Evolution -- The Default Email Client for Ubuntu Jun 7, 2009, 10 :02 UTC (0 Talkback[s]) (7945 reads)
"Finding your mail files in Evolution is pretty straightforward if you know where to look. The default path is:
"/home/(user)/.evolution/
In the "mail" folder you’ll find bog-standard .mbox files which you can import into any other email app worth its salt. Evolution also has a nifty backup and restore feature that will compress your data (email + addresses, calendars, contacts, notes & to-dos) into a handy (for Linux users) .tar.gzip file --and restore a full data set from the same file."