AD Distribution group not seen in EMC 2010

Hi,

I am using 2008R2 and have Exchange 2010.  I've created some Global Distribution Groups in ADU&C's.  I have set a mail address for each in turn.  I have waited over 24hrs.  I have updated my global address list on my local pc.  The problem is that I cannot see the new distribution lists in the GAL.  I also cannot see the distribution lists in EMC.  Other lists are in there but I cannot see why the new ones aren't.  Obviously in hindsight I should have create the lists in EMC but I wish to know how I can get my AD lists to the EMC and in the GAL?

Thanks

Smithy