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EWS and Microsoft Graph
What are EWS and Microsoft Graph?
Exchange Web Services (EWS) and Microsoft Graph are the two ways applications connect to Microsoft Exchange to read and write calendars, such as room bookings. EWS is the older interface. Microsoft Graph is the modern API for Microsoft 365, and Microsoft is retiring EWS in Exchange Online, so cloud tools must move to Graph.
What the EWS retirement means
Microsoft is phasing EWS out of Exchange Online, with a phased disablement starting 1 October 2026 and full retirement on 1 April 2027. Any room booking, display or visitor tool that still talks to Exchange Online through EWS has to move to Microsoft Graph before then. The retirement applies to Exchange Online only. On-premises Exchange Server keeps EWS.
What to check with your vendors
- Does the tool connect to Exchange Online through Microsoft Graph today?
- Is there a legacy EWS enterprise application in your Entra ID tenant to remove?
- Which permissions does the Graph connection request, and can they be scoped to the room mailboxes?
How AskCody connects
AskCody has completed its move to Microsoft Graph: it runs on Microsoft Graph for Microsoft 365, and on-premises Exchange Server is supported through EWS. Customers who upgraded from the former EWS connection should remove the legacy AskCody EWS enterprise application, as described in upgrade the Exchange Online integration to Microsoft Graph. See Microsoft integrations.
Frequently asked questions
Does the EWS retirement affect on-premises Exchange Server?
No. The retirement applies to Exchange Online. On-premises Exchange Server continues to use EWS.
Which permissions does AskCody request through Microsoft Graph?
Calendar access for room, desk and user calendars, user read for sign-in and group read for Entra ID group sync. The current list is published at help.askcody.com/permissions.
Related terms