How do I allow the creation of local folders on a ssl imap server

[Ralph Blach]

I have a created and ssl imap server and it works great.
The mail reader which I am using is mozilla mail, which I like,
mainly becuase I am familiar with it.

I also have another pop account which is managed by my internet 
provider.  Why can I create local folders under the pop account and
not on the imap/ssl account.  I would really like to create
local folders under the imap/ssl account.

Thanks

Chip