Please describe the problem:
After switching to offline mode,  I am unable read any mail in my inbox.  
Before switching to offline mode, I have marked my inbox with "Copy Folder
content locally for offline operation".   This is happening with the latest
Evolution HEAD build.  

Using iMAP Protocol with backend GroupWise mail server.

Steps to reproduce:
1. Right-click 'inbox' and ensure that the option "Copy folder content locally
for offline operation" is checked.
2. Click File->Work Offline 
3. Open any email in inbox 

Actual results:
I get the message "Unable to retrieve message
This message is not currently available"

Expected results:
Should open the email message

Does this happen every time?
always

Other information:
I read mails in offline mode daily when I am at home.   This used to work in
some of the previous builds.   So, I have several mails cached locally.  The
irony is that, I am unable to read these mails too.