Use the EAC to enable or disable Outlook Web App

 
  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 Web App 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 Web App, under Outlook Web App: Enabled, click Disable.

      A warning appears asking if you're sure you want to disable Outlook Web App. Click Yes.

    • To enable Outlook Web App, under Outlook Web App: Disabled, click Enable.

  5. Click Save to save your change.

OR

Use the Shell to enable or disable Outlook Web App

 

This example disables Outlook Web App for the mailbox of Yan Li.

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

This example enables Outlook Web App for the mailbox of Elly Nkya.

 
 
Set-CASMailbox -Identity This email address is being protected from spambots. You need JavaScript enabled to view it. -OWAEnabled $true

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