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Is it safe to Enable employee access to the new Outlook for Windows?

Carlos Lino 6 Reputation points
2024-04-01T22:45:37.7266667+00:00

Hello!

I have some users who are not enable the new Outlook, others are with no issues and they have the same settings. Why?

If safe to run this script?

Set-CASMailbox -Identity <MailboxIdentity> -OneWinNativeOutlookEnabled <$true | $false>

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Microsoft 365
Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
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Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Faery Fu-MSFT 17,281 Reputation points Microsoft Vendor
    2024-04-02T05:44:07.06+00:00

    Hi @Carlos Lino ,

    There could be several reasons why some users are unable to enable the new Outlook even though they have the same settings. Here are a few possibilities:

    1. Outlook Desktop Registry Key: The new Outlook for Windows is enabled by default for all users with a Microsoft Entra account and Exchange Online account. However, the Outlook Desktop registry key can be configured to enable or hide the New Outlook toggle.
    2. Exchange Online PowerShell: This can be used to prevent or allow access to mailboxes by the new Outlook for Windows.
    3. Software Version: If users are running an older version of Windows or Outlook, they may not be able to enable the new Outlook.

    As for the script you’ve mentioned, it is a PowerShell command used to enable or disable the new Outlook for Windows for an individual mailbox.

    Before running this script, please ensure the following:

    1. Permissions: Make sure you have the necessary permissions to perform this procedure.
    2. User Notification: Inform your users before making changes to their mailboxes.
    3. Backup: Always back up any important data before running scripts.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

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