Shared Mailbox not seen in Offline Address Book over a day

Tonito Dux 956 Reputation points


I wanted to run something by the experts.
We are using ExOP 2016 and are working in Hybrid mode. When I create a new shared mailbox with the New-RemoteMailbox command there is always a problem with this mailbox appearing in the OAB. We use cached mode for our Outlook 365 clients.
I am aware that there is a 1x day update for the OAB but I am not sure how many companies are comfortable waiting 24 hours for the entry to appear in the OAB. I am mitigating the issue by running the Get-OfflineAddressBook | Update-OfflineAddressBook on our local exchange, then do the update on the client by downloading the full OAB. After this procedure the entry is added immediately to the OAB and i was wondering if there is a way to speed this up?

Until I have the entry in the OAB the user which has "send as" for the newly created shared mailbox gets the error message 0x80070005-0x000004dc-0x00000524 about not having the rights to do so. In Outlook OWA it works right away so this is a sync issue.


Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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Accepted answer
  1. Andy David - MVP 142.8K Reputation points MVP

    Yea, I always tell people to wait a day ...or pick the mailbox from Outlook Web App or the "All User" Address list in Outlook which is an online lookup.

    1 person found this answer helpful.

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  1. Joyce Shen - MSFT 16,646 Reputation points

    Hi @Tonito Dux ,

    Do suggestions above help? And below is an article introduces OAB related information, you could take a reference as well

    Updating the Offline Address Book in Exchange and Outlook

    Modify the OAB download behavior in Outlook


    Modify default OAB generation schedule in Exchange

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