IMAP IDLE and MMP

Helo,

As it was said in the thread " JES5 Outlook connector requirements?",  
enabling IMAP IDLE is very simple :

telnet localhost 143
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4 IMAP4rev1 ACL QUOTA LITERAL+ NAMESPACE UIDPLUS  
CHILDREN BINARY UNSELECT SORT LANGUAGE IDLE XSENDER X-NETSCAPE  
XSERVERINFO X-SUN-SORT X-SUN-IMAP X-ANNOTATEMORE X-UNAUTHENTICATE  
XREFRESH AUTH=PLAIN] vs-ms-4.sipr-dc.ucl.ac.be IMAP4 service (Sun Java 
(tm) System Messaging Server 6.3-4.01 (built Aug  3 2007; 32bit))


But this works only on the mailstore.

As we are in an environment vhere the users are talking to the MMP  
only, how could we enable IMAP IDLE in that case ?

The version of the Messaging server is the same on both back-end  
(mailstores) and front-ends (MMP) :

Sun Java(tm) System Messaging Server 6.3-4.01 (built Aug  3 2007; 32bit)
libimta.so 6.3-4.01 (built 17:08:29, Aug  3 2007; 32bit)
SunOS mailstore-2-2 5.10 Generic_Patch i86pc i386 i86pc


Thanks,
--
Pascal