courier-imap conflicts with dovecot-imapd?

[thufir]

A while back I started using balsa in place of thunderbird to read maildir 
locally:

https://groups.google.com/d/msg/mozilla.support.thunderbird/d080RsLE8IU/
djY8qP6Zb1gJ


In looking at this again, installing courier seems like a non-starter.  
Trying to install courier-imap results in:

The following NEW packages will be installed:
  courier-authdaemon{a} courier-authlib{a} courier-authlib-userdb{a} 
  courier-base{a} courier-imap{b} expect{a} gamin{a} libgamin0{a} 
0 packages upgraded, 8 newly installed, 0 to remove and 2 not upgraded.
Need to get 770 kB of archives. After unpacking 2,220 kB will be used.
The following packages have unmet dependencies:
 courier-imap : Conflicts: imap-server which is a virtual package.
The following actions will resolve these dependencies:

     Remove the following packages:
1)     dovecot-imapd               
2)     dovecot-postfix             
3)     mail-stack-delivery         


I could just stick with dovecot?  I don't want to remove dovecot-postfix 
as I like that integration, and removing mail-stack-delivery sounds like 
a bad idea.

In dovecot, I see:

root at dur:~# 
root at dur:~# nl /usr/share/dovecot/protocols.d/imapd.protocol 
     1	protocols = $protocols imap
root at dur:~# 
root at dur:~# grep protocol /etc/dovecot/dovecot.conf 
# Enable installed protocols
!include_try /usr/share/dovecot/protocols.d/*.protocol
root at dur:~# 

so is IMAP enabled?  I just want to make a locally stored maildir 
available, also locally, as an IMAP directory for thunderbird as a 
client.  It's all on one machine.



thanks,

Thufir