Enable or disable Outlook on the web for a mailbox

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.

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

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 EAC to enable or disable Outlook on the web

  1. In the 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.

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 Ellyn@contoso.com -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:

  • 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.

Or

  • Run the following command in Exchange Online PowerShell.

    Get-CASMailbox <identity>
    

    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.