Outlook 2016 address book not updating
And since this website’s main focus is on Outlook, it makes sense to start with Outlook as well ;-).
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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.
Instances of mail that is bounced back to the sender may also be fixed.
Please use the steps below to update your Global Address Book.