How to update the owner name of an Outlook calendar following a user name change

Question

Hello,

I am an administrator for an M365 tenant, and I use Entra ID and Exchange Online.
Users are using Outlook New on Windows 11.
I had to change the last name of two of my users in Entra ID.
In the “Contacts Calendar” view in Outlook New, the names of these two contacts calendars are not updating.
I checked the web version of Outlook, and the old names are still there.
The change has been applied to all other Microsoft services.
The issue is therefore only present in Outlook.
Outlook New does not have a cache like older versions, so I cannot delete it.

Deleting the calendar and then adding it again updates it with the new name.
However, I cannot do this manually on all users' devices.

How can I ensure that calendar owner names reflect changes automatically without needing to manually delete and re-add calendars?

Thank you in advance for your help.

Answer 1

Hi @John756 ,

Welcome to our forum!

From your description, the web version of Outlook also shows the old name, it is possible that the issue is with Exchange online not reflecting the name change.

To resolve the issue where calendar owner names in Outlook (New) and Outlook on the web aren't updating after a name change in Entra ID, follow these steps:

1. Verify and Update Exchange Online Attributes

   Check DisplayName in Exchange Online:

   Use the Exchange Admin Center or run PowerShell:

       Get-Mailbox -Identity "******@domain.com" | FL DisplayName

    If incorrect, update it:

      Set-Mailbox -Identity "******@domain.com" -DisplayName "New Name"

 2. Force Global Address List (GAL) and Offline Address Book (OAB) Updates

    Update the GAL:

     Update-GlobalAddressList -Identity "Default Global Address List"

    Update the OAB:

     Up_date-OfflineAddressBook -Identity "Default Offline Address Book"_

     Wait for replication (up to 24 hours) or force clients to download the OAB:>

     Users can go to classic Outlook > Send/Receive > Download Address Book > Check "Download Changes since last Send/Receive".

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