New exchange 2007 users doesnt have email address

Suddenly when i create some user this never gets the email address.

I have Exchange 2003 and 2007 in coexistence and this happens on the beggining but after some commands tiped by the administrator works for a while. what cain i do?

By the way i already try :

Set-EmailAddressPolicy "Default Policy" -IncludedRecipients AllRecipients but i have an error:

Set-EmailAddressPolicy : The operation cannot be completed on the default e-mai
l address policy.
At line:1 char:23
+ Set-EmailAddressPolicy <<<<  "Default Policy" -IncludedRecipients AllRecipien
    + CategoryInfo          : InvalidOperation: (Default Policy:ADObjectId) [S
   et-EmailAddressPolicy], InvalidOperationException
    + FullyQualifiedErrorId : F8A4CD8B,Microsoft.Exchange.Management.SystemCon
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have you created mailbox under ex2003 or ex2007 ?
Jesus_GuevaraAuthor Commented:
if i create in exchange 2007, everything works fine, only happens when i create the mailbox in E2k3
Can you check if your recipient update service status under exchange manager ? and if it's pointing to correct DC/GC

You can right click and select update now if they are pointing to correct location

also check on user's ad properties if option Automatically update email address is checked.

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Jesus_GuevaraAuthor Commented:
Thanks a lot
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