Global address list cached mode not updating
To get the OAM to immediately generate run the following command: Update-Offline Addressbook “name of offline address book”.
You may encounter an issue stating that the System Attendant Service is not running or you do not have permission. Make sure you are running the Exchange Management Shell as Administrator and 2. *note* The Service is named “Microsoft Exchange System Attendant”.
Is Outlook ignoring their OAB and getting a live copy of the GAL? If you have more than 1 Active Directory site, just the site you're experiencing issues in should do it. If you don't do this, it can take a substantial amount of time for the clients to update the OAB.
If that's not it, check that LDAP Replication is fine.
However, if I delete my files (Offline Address Book) then I can see the new conference room in the Global Address List. The service was not started on one of the servers and therefore some users were getting old oab's while other users were getting fresh copies. if you're having this issue, make sure the file replication service is started. Chances are good that OAB generation is failing for some reason.
24/02/13 If you create a new user, give them a mailbox, and they seemingly fail to appear then don’t panic! If you receive an error message then you can investigate further (Note: Set your Outlook client to send you a delivery report on the test email as well). If you are using Outlook you may be in “Cached Mode”, and you are looking at a copy called the “Offline address book” This only gets updated Every 24 hours, and the copy on the server only gets updated every 24 hours at (by default).
Firstly and fore mostly: If you do anything in Exchange: Apply the “cup of coffee rule”, never make a change then go and prove that change works straight away! However most of us work in the real world and you have a user who needs to use this mailbox yesterday! Then check the mailbox Exists (See Check for existence of mailbox sections below). In addition to this there a a few methods by which your Outlook clients get the offline address book. Outlook 2003 (and older)* clients get their OAB from a public folder, Outlook 2007 (and newer) clients can get their OAB from ‘Web-based distribution’ (basically form the website on the Exchange (or Exchange CAS) server.
The User/Mailbox IS listed on the Server But NOT in Outlook.
Support for Outlook 2000 was dropped with Exchange 2007, Exchange 2010 only supports Outlook 2003 (post SP2). In the diagram below you can see this server is performing public folder AND web based distribution, this is probably because you ticked this box when you installed the product.