dovecot - Mar 2011 - dsync warning/error - mailbox needs recreation

What does this mean? These lines occur on subsequent runs of "dsync
-u user backup target" 

dsync(dmiller at amfes.com): Warning: Destination
mailbox INBOX has been modified, need to recreate it before we can
continue syncing
dsync(dmiller at amfes.com): Error: Can't delete mailbox
INBOX: INBOX can't be deleted. 

-- 
Daniel

On Fri, 2011-03-11 at 21:00 -0800, Daniel L. Miller
wrote:
> 
> What does this mean? These lines occur on subsequent runs of "dsync
> -u user backup target" 
> 
> dsync(dmiller at amfes.com): Warning: Destination
> mailbox INBOX has been modified, need to recreate it before we can
> continue syncing
> dsync(dmiller at amfes.com): Error: Can't delete mailbox
> INBOX: INBOX can't be deleted. 
It means that the INBOX's mailbox GUID has changed, so Dovecot has to
treat them as different mailboxes. For all non-INBOXes it would delete
the mailbox and resync it. But INBOX can't be deleted..

As for why the GUID changed, I don't know. Maybe you deleted some file
manually in the destination? Or maybe some bug.