Recently I built two Exchange 2013 servers, CAS & mailbox and added them to my existing 2010 organization. Now, people who HAVE NOT been migrated to the 2013 mailbox server are not getting an updated OAB. Those on 2013 are getting an updated OAB.
Besides the obvious answer to hasten the migration to 2013, why aren't the 2010 mailbox users not getting an updated OAB?
Thank you,
Chris