I’m giving it a 99% chance that you will (and if you don’t you have a serious problem at hand!) The reason you are not seeing these new users appear in outlook cached mode, but can see them in OWA, is because for one or another reason the offline address book is not generating properly. In the right pane you should see the default offline address list. Right click in the right pane and create a new offline address list. Now drill down to the mailbox database, right click it and set the new OAB to be the default for that database. Open outlook with a mailbox that is residing in that mailbox database 7. Drill down the organization configuration, mailbox 3.The Exchange System Attendant service is responsible for the generation of oab.This service is available only on a server that has the mailbox role installed.This is the master list of all the Exchange 2007 objects, and the operating system won't let you mess with it.Fortunately, there is a well respected work-around, create a new Global Address List, and then 'update' the mailbox.Asynchronous Transfer Mode: Used to move computer data, video, or audio over a network.
Within the Exchange OAB folder, there will be a folder with GUID name which holds the actual OAB files for distribution.
A fairly common (and annoying) problem which seems to like to popup after migrations, yet not unsolvable.
The key issue here is that there are new users added to the directory but they are not showing up in outlook.
Here is a free tool to monitor your Exchange Server.
Free Download of Solar Winds Exchange Monitor As an alternative to clicking in the Exchange Management CONSOLE, you could type commands in the Exchange Management SHELL.