[Exim] IMAP error

Can someone point me in the right direction on this error. It occurs
when I first connect to the mail server locally using Outlook Express.
It doesn't seem to do anything.

Lost mailbox lock

Configuration:
Account: [my account]
Server: 192.168.1.110
User name: [my user name]
Protocol: IMAP
Port: 143
Secure(SSL): 0
Code: 800cccdd

On another note, I would like to connect to this mail server remotely
using Outlook, I could use some help with this also. I've got
Squirrelmail working so I can get my mail with a web interface, but at
work I know users would probably prefer Outlook Express.

Thanks, Brian