Push or pull notification, no events received

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Hi,

I have buit the pushNotification sample (Exchange SDK) or a server to test
it. The subscriber is ok,
the external host listening received the sendNotification (i confirm by
returning the OK) but it never receive any event when i modify a calendar or
send email for the account binding.

I try to test with the pullSubcription, i reveice the SubscriptionId and
Watermark but never anything else however the account binding has an email
account and i never stop modifing it (calendat or sending mail).

How can i be sure that exchance 2007 fire some events ? where can i catch
those events ? did i miss something ? (i'm using the exchange 2007 SP1 trial
version).

Everything else works fine (createitm, subscribe, ...)
i need some help
.