Enable or disable MAPI for a mailbox


Applies to: Exchange Online, Exchange Server 2013

Topic Last Modified: 2012-10-26

You can use the EAC or the Shell to enable or disable MAPI for a user mailbox. When MAPI is enabled, a user's mailbox can be accessed by Microsoft Outlook or other MAPI email clients. When MAPI is disabled, it can't be accessed by Outlook or other MAPI clients. But the mailbox will continue to receive email messages, and a user can access it to send and receive email by using Outlook Web App, a POP email client, or an IMAP client, assuming that the mailbox is enabled to support access by those clients.

Support for Outlook Web App 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:

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

  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 MAPI, 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 MAPI, under MAPI: Enabled, click Disable.

      A warning appears asking if you're sure you want to disable MAPI. Click Yes.

    • To enable MAPI, under MAPI: Disabled, click Enable.

  5. Click Save to save your change.

This example disables MAPI for the mailbox of Ken Sanchez.

Set-CASMailbox -Identity "Ken Sanchez" -MAPIEnabled $false

This example enables MAPI for the mailbox of Esther Valle.

Set-CASMailbox -Identity "Esther Valle" -MAPIEnabled $true

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

To verify that you’ve successfully enabled or disabled MAPI 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 MAPI is enabled or disabled.


  • Run the following command in the Shell.

    Get-CASMailbox <identity>

    If MAPI is enabled, the value for the MapiEnabled property is True. If MAPI is disabled, the value is False.