This is the folder structure of my IMAP Server (cyrus too)
INBOX +Foo +Bar +Bla ++Bla sys +adm teaching +courses projects +a +b general +fun
etc.pp.
With the IMAP protocoll you have only access to one of them. (e.g. INBOX+sys), but not to all. You can't subscribe to the other folders. With IMAP4v1 you can give the namespace "." and then you can subscribe to every folder you like.
This is the folder structure of my IMAP Server (cyrus too)
INBOX
+Foo
+Bar
+Bla
++Bla
sys
+adm
teaching
+courses
projects
+a
+b
general
+fun
etc.pp.
With the IMAP protocoll you have only access to one of them. (e.g. INBOX+sys), but not to all. You can't subscribe to the other folders. With IMAP4v1 you can give the namespace "." and then you can subscribe to every folder you like.