You can update OAB by 2 ways via EMS or using Power Shell

1 To update via  EMS

Open EMC>Organizational Configuration>Mailbox>Offline Address Book tab.

Right click on desired Address Book and press update.

2. Via Power Shell

Type: Update-OfflineAddressBook –Identity “Address List Name”

To update all Address Books type : Get-OfflineAddressBook | Update-OfflineAddressBook

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