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In that case the whole OAB is being downloaded again.
Learn how offline address books are created and distributed in Exchange 2016.
This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.
Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.
For immediate OAB generation and distribution (both PF, and web based distribution through CAS) I do following steps: 1.
Run Update-Offline Addressbook “offline address book” in Exchange Management Shell.
e.g Update-Offline Addressbook “Default offline address book” 2.
This OAB is also the default OAB, which means it's the OAB that's used by mailboxes and mailbox databases that don't have an OAB assigned to them.
This is called the Offline Address Book and is being generated on the Exchange server.
Due to various synching schedules, it can take up to 48 hours before you could actually see a change in Outlook after a modification has been made on the Exchange server or in Active Directory.
It is availalble to Exchange Client softwares (e.g Outlook 2007) when users are not connected to Exchange Server and are offline.
OABs are not generated frequently in a day because OAB generation process consumes much system resources if they contain hundreds of email addresses.Is there any way where I can force update/re-create the OAB for them ?