Enable or disable Outlook on the web for a mailbox in Exchange Online

You can use the EAC or Exchange Online PowerShell to enable or disable Outlook on the web (formerly known as Outlook Web App) for a user mailbox. When Outlook on the web is enabled, a user can use Outlook on the web to send and receive email. When Outlook on the web is disabled, the mailbox will continue to receive email messages, and a user can access it to send and receive email by using a MAPI client, such as Microsoft Outlook, or with a POP or IMAP email client, assuming that the mailbox is enabled to support access by those clients.

Note

Support for Outlook on the web and MAPI, POP3, and IMAP4 email clients is enabled by default when a user mailbox is created.

Tip

Outlook on the web is required for the Share to Outlook feature to work in Microsoft Teams.

For additional management tasks related to managing email client access to a mailbox, see the following articles:

Disabling access to Outlook on the web will also limit the use of the new Outlook for Windows.

What do you need to know before you begin?

Tip

Having problems? Ask for help in the Exchange forums. Visit the forums at Exchange Online or Exchange Online Protection.

Use the new EAC to enable or disable Outlook on the web

  1. In the new EAC, navigate to Recipients > Mailboxes.

  2. In the list of user mailboxes, click the mailbox that you want to enable or disable Outlook on the web. A display pane is shown for the selected user mailbox.

  3. Under Mailbox settings > Email apps, click the Manage email apps settings link.

  4. In the Manage settings for email apps display pane, do one of the following.

    • To disable Outlook on the web, for the Outlook on the web option, when the button is Enabled, set to Disabled.

    • To enable Outlook on the web, for the Outlook on the web option, when the button is Disabled, set to Enabled.

  5. Click Save to save your change. A message Email app settings updated successfully is displayed. Click Close to exit.

Use the Classic EAC to enable or disable Outlook on the web

  1. In the Classic EAC, navigate to Recipients > Mailboxes.

  2. In the list of user mailboxes, click the mailbox that you want to enable or disable Outlook on the web for, and then click Edit Edit icon..

  3. On the mailbox properties page, click Mailbox Features.

  4. Under Email Connectivity, do one of the following:

    • To disable Outlook on the web, under Outlook Web App: Enabled, click Disable.

    A warning appears asking if you're sure you want to disable Outlook on the web. Click Yes.

    • To enable Outlook on the web, under Outlook Web App: Disabled, click Enable.
  5. Click Save to save your changes.

Note

You can enable and disable Outlook on the web for multiple user mailboxes by using the EAC bulk edit feature. For more information about how to do this, see the "Bulk edit user mailboxes" section in Manage user mailboxes.

How do you know it worked?

To verify that you've successfully enabled or disabled Outlook on the web for a user mailbox, do one of the following:

  • In the EAC, navigate to Recipients > Mailboxes, click the mailbox, and then click Edit Edit icon..

  • On the mailbox properties page, click Mailbox Features.

  • Under Email Connectivity, verify whether Outlook on the web is enabled or disabled.

Use Exchange Online PowerShell to enable or disable Outlook on the web

This example disables Outlook on the web for the mailbox of Yan Li.

Set-CASMailbox -Identity "Yan Li" -OWAEnabled $false

This example enables Outlook on the web for the mailbox of Elly Nkya.

Set-CASMailbox -Identity "Elly Nkya" -OWAEnabled $true

For detailed syntax and parameter information, see Set-CASMailbox.

How do you know this worked?

To verify that you've successfully enabled or disabled Outlook on the web for a user mailbox, do one of the following:

  • Run the following command in Exchange Online PowerShell.

    Get-CASMailbox -Identity <MailboxIdentity>
    

    If Outlook on the web is enabled, the value for the OWAEnabled property is True. If Outlook on the web is disabled, the value is False.