I have a customer whom i've done Migration for about (1000) user and they have an issue with users on Outlook 2007.
Whenever they create new users on Exchange 2010. the users on outlook client 2007 can't find these new created users however, users who use Outlook 2010 or 2013 can see them.
On Exchange server 2010 (2 HT and CAS) don't have any issues with OAB as I have migrate OAB to the Exchange 2010.
The generate server is the 2010.
I found a work around which is if I go to the outlook user's datafile location and delete all the files with .oab extension, then re-open outlook. the problem would be solved but i'm not sure yet if the address book would update or would work properly.
Any one had a similar issue?