microsoft, Exchange server, SBS2003, Black Berry is not authenticating

We installed a SMS2003 with exchange 2003. with domain name  .ae but our actual doamin is .com
all pop3 and SMTP is working fine. but the black berry set is not accept the email account. As earlier it was working properly with my old email server. only change is that that was install only .com domain.
from where I need to check and correct it
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Go to your blackberry administration and check if the URL is correct for the MDS service.

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