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Microsoft 365: How to turn EWS or IMAP or ActiveSync On or Off

Use the Exchange admin center (EAC) to manage email app access for a mailbox:

  • Access Mailbox Settings:
    • In the EAC, go to Recipients > Mailboxes.
    • Select the desired mailbox from the list.
    • In the mailbox details pane that appears, go to the Mailbox tab.
    • Find the Email apps section, and click Manage email apps settings.
  • Enable or Disable Email Apps:
    • In the Manage settings for email apps pane, you can enable or disable the following email app protocols:
      • Outlook desktop (MAPI)
      • Mobile (Exchange ActiveSync)
      • IMAP
      • POP3
      • Outlook on the web
    • Toggle the switches to Enabled or Disabled as needed.
  • Save Changes:
    • Click Save to apply the changes.
    • A confirmation message should appear.
    • Click Close to exit the pane.
Improve your email management:

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Advanced Configuration (PowerShell):

For more granular control, use Exchange Online PowerShell. Refer to the official Microsoft documentation: Exchange Online PowerShell.