Need Exchange web services help: How to get push notificatons for all mailboxes of Exchange server.

[Sanjay Chavan]

Currently, I am subscribing to EWS (Exchange Web serviceces) through Java Web service client using administrative credentials. After successful subscription EWS giving me push notifications only from Administrators mailbox. These push notifications I am listening through Java Web Service (URL of this web service given in subscription request).
Now, I want to get push notifications for all mailboxes of Exchange Server.
How to accomplish this through single Subscription and using Administrative credentials?

Thanks,
Sanjay