Exchange 2010 calendar issue

Hi all,<o:p></o:p>

I just installed a new Exchange 2010 organization.
Users cannot see mailbox resources (other user’s mailbox or room mailbox for example) availability.<o:p></o:p>

I checked the configuration of all services (Autodiscover,...) and found them ok.<o:p></o:p>

Is there something that I need to focus on it to resolve my issue?<o:p></o:p>

Thank you in advance for your help.<o:p></o:p>

Regards<o:p></o:p>