Urgent Help: courier-imap installation

["Kevin Smith" <kevin@netsmith.ltd.uk>]

Hi All,

What can I do about this error?

Preconfiguring packages ...
(Reading database ... 58917 files and directories currently installed.)
Preparing to replace courier-imap 1.4.3-2.3 (using
.../courier-imap_1.4.3-2.3_powerpc.deb) ...
ERR: config file missing
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
ERR: config file missing
dpkg: error processing
/cdrom//pool/main/c/courier/courier-imap_1.4.3-2.3_powerpc.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
ERR: config file missing
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 /cdrom//pool/main/c/courier/courier-imap_1.4.3-2.3_powerpc.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

I installed courier-imap and then tried to remove exim.  Which caused these
problems... how do I reinstall courier-imap?

Thanks,

Kevin