Security News > 2023 > September > Microsoft to start retiring Exchange Web Services in October 2026
Microsoft said today that the Exchange Web Services API for Exchange Online and Office 365 will be retired in approximately three years.
These resources can be retrieved from various sources, including Exchange Online, Exchange Online as part of Office 365, and on-premises editions of Exchange.
"Today, we are announcing that on October 1, 2026, we will start blocking EWS requests from non-Microsoft apps to Exchange Online," the Exchange Team said on Tuesday.
No changes are being made to EWS within Exchange Server, and the adjustments made in Exchange Online will have no impact on Outlook for Windows or Mac, Teams, or other Microsoft products.
NET. Microsoft advised developers using the EWS API to switch to the Microsoft Graph API until retirement, as it will also provide them access to Exchange Online data.
The company also warned developers of some feature gaps between EWS and Microsoft Graph, with the most important ones including no access to archive mailboxes, lack of folder-associated information and user configuration, no Exchange Online management capabilities, and no third-party app access to Exchange Online public folders.