[Dovecot] Making shared folders "unmovable"

[Dave]

 > I have this in my public namespace, and it works well:
 > ...
 > What does your dovecot -n say?

I assume these are the lines you're looking for from dovecot -n?

mail_plugins: acl imap_acl
plugin:
   acl: vfile

Also, I just saw when I ran that command that it's Dovecot 1.1 series.  
Not 1.2 series.  My bad. :(  Will that make a difference?  I also am not 
super-familiar with namespaces, so I don't know that any are set up in 
any way.  I'll look at the documentation for namespaces.

David