(Updated) Update to EWS Access for Kiosk / Frontline Worker Licenses [MC1191578]

Message ID: MC1191578 (Updated)

Updated June 10, 2026: We have updated the timeline. Thank you for your patience.

We’re making some changes to Exchange Web Services (EWS).

Starting October 1, 2026 (previously June 30), we will start to block EWS access for all mailboxes without license rights to EWS. This is another step in our ongoing commitment to enhance the security and control mechanisms of EWS.

[How this will affect your organization:]

The impacted licenses are:

• Exchange Online Kiosk
• Microsoft 365 and Office 365 F1
• Microsoft 365 and Office 365 F3

As stated in the Service Descriptions, these licenses do not provide access to mailboxes via EWS, but these restrictions were never enforced. With this change, EWS access for users with only these license types will be blocked.

[What you need to do to prepare:]

If you wish these users to continue to use EWS, and your users are licensed with one of these noted above, you’ll need to assign a new license, one containing EWS access rights. For example, you could assign an Exchange Online Plan 1 or 2 license, or a Microsoft 365 or Office 365 E3 or E5 license.

Starting October 1, 2026 (previously June 30), requests to use EWS without a suitable license will result in a HTTP 403 response.

Learn more: Update to EWS Access for Kiosk / Frontline Worker Licensed Users 

Source: Microsoft

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