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.

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Advanced Configuration (PowerShell):

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