Mail.app --> mutt

Hi,
I have loads of e-mails in ~/Library/Mail which refuse to display in Mail.app. The message is ..

+The message from John Smith <johnsmith@mydomain.com> concerning “some subject” has not been downloaded from the server. You need to take this account online in order to download it+

'thing is, the account is online. And the mails are in my Mail folder, as if I navigate there with the Finder, I can open e-mails (they open in Mail.app) which display the above message, if I try to access them directly from within Mail.app.

So I've had enough, and would like to get mutt onto my Mac and use that, instead.

Getting mutt and installing it will be trivial, but is there any way I'm going to be able to get it to access all of my mails that are in ~/Library/Mail ?

Anyone done this? Tips?

Thanks.