Where does Evolution keep its local files?

I give up, I've been looking for ages (nor can find any documentation on novell's site to help. Anyway that keeps on timing out on me in searching). For some reason Thunderbird simply won't work with our IMAP server, but Evolution will. Keeping a shared data folder with Mozilla is relatively easy, as one can specify where a local folder is held, as is tracking down the mail files on the system under .mozzilla. But where on heck does Evolution keep them? And can one specify to put them onto a network drive? It's driving me nuts!