new folder autosubscribe to other user?

[Andi Voss]

Hi,

I need a shared folder where user can create (shared) folders in.
This is working, but the new folder created by a user is not shown at 
each other users mailbox (who has access to the main shared folder), 
until each other user subscribes this folder.

Is it possible to autosubscribe folder created by other users once each 
user is loggin in?

We are using cyrus with virtdomain support and Thunderbird is our 
IMAP-Client.

Any other ideas how to solve this specification?
More information needed?

Thanks for help
Andi