Please describe the problem:
I'm using Evolution with the citadel.org groupware server, and i'm connecting via imap. The issue i'm having is that evolution won't resync the read flags in both directions. 

Steps to reproduce:
So, when i read a mail in the webinterface, and the server marks it as  read, evolution will continue showing it as unread. If i read a mail in evolution, it won't mark it as read on the imap server.

Actual results:
connect evolution to an account you can create via 
https://uncensored.citadel.org
Connect evolution with the account you've created via imap.
Send you a mail in. 
Try reading the mail with evolution or the webmail interface.

Expected results:
evolution should resync the states.

Does this happen every time?
yes

Other information:
If you need more information about citadels imap server join #citadel in freenode, or post a message to the citadel support room.