Exchange server 2010 - Resource mailbox not showing up in GAL

i created  a new resource user and mailbox and can not see it in the GAL when I go to set a new meeting. If I go to the Outlook Web Acces I can see the
new resource. How can I get the GAL to see the new resource so all staff can start signing up for it
         The
GAL (Global Address List) is essentially a list of all email recipients in your organization.  It
does not contain other address lists.  It could
however contain distribution groups.
Address lists are like the GAL,
but more specific.  For example: “All Rooms”.  This
would show all room mailboxes.  All room mailboxes
would also appear in the GAL.
You
don’t email an address list.  These are for
recipient browsing/clicking only.  You may be
confusing Address Lists with Distribution groups.
Outlook
running in cached mode doesn’t connect to Exchange for either of these two types of address lists. Instead
it uses what’s called an OAB (Offline Address Book) which is generated by a mailbox server once a day and distributed by a client access server or via system Public Folder. 
Anytime
there is an issue with an address list, I check using Outlook in online mode or through OWA; since neither of these methods use an offline copy of data.  If
you find OWA works and Outlook cached mode doesn’t; it may be due to OAB generation issues or delays.

The default update interval
of OAB is 12 hours. You need to need until then to get it displayed in the GAL for Outlook Cached Mode...if you not you can go Outlook online Mode
Please refer to 13 in this
link:
http://social.technet.microsoft.com/Forums/en-US/exchangesvrgeneral/thread/0752c1fc-1a6b-4c42-a10a-a280db2f59b8#13
If the OAB still can’t
be updated after 12 hours please enable the diagnostic logging for MSexchangeSA>OAL Generator to maximum.
http://support.microsoft.com/kb/821910/en-us
Exchange Queries

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