https://sunsetless.com/guides The EWS retirement in Exchange Online and the move from Exchange Web Services to Microsoft Graph. en Sat, 03 Oct 2026 00:00:00 GMT https://sunsetless.com/guides/ews-403-exchange-onlinehttps://sunsetless.com/guides/ews-403-exchange-onlineSat, 03 Oct 2026 00:00:00 GMTAn application suddenly gets 403 Forbidden from EWS in Exchange Online. The four settings that cause it, how to check each one, and how long the fix lasts. https://sunsetless.com/guides/ews-app-listhttps://sunsetless.com/guides/ews-app-listSat, 03 Oct 2026 00:00:00 GMTThe EWS usage report and the EWSAllowedAppIDs list name applications by ID. How to tell who owns each one, who has to fix it, and what to do until then. https://sunsetless.com/guides/ews-extended-properties-graphhttps://sunsetless.com/guides/ews-extended-properties-graphSat, 03 Oct 2026 00:00:00 GMTHow an EWS ExtendedPropertyDefinition maps to a Microsoft Graph extended property, how to read, write and filter by it, and what Graph cannot do. https://sunsetless.com/guides/ews-impersonation-graphhttps://sunsetless.com/guides/ews-impersonation-graphSat, 03 Oct 2026 00:00:00 GMTMicrosoft Graph has no ImpersonatedUserId. How a service that impersonated users in EWS reaches mailboxes in Graph and stays limited to the ones it needs. https://sunsetless.com/guides/ews-item-ids-graphhttps://sunsetless.com/guides/ews-item-ids-graphSat, 03 Oct 2026 00:00:00 GMTHow to convert stored EWS item IDs to Microsoft Graph IDs, when Graph IDs change, what immutable IDs fix, and which ConvertId formats Graph lacks. https://sunsetless.com/guides/ews-retirementhttps://sunsetless.com/guides/ews-retirementThu, 01 Oct 2026 00:00:00 GMTEWS retirement dates for Exchange Online: EWSAllowedAppIDs required from October 10, 2026, the April 1, 2027 shutdown, and a migration checklist. https://sunsetless.com/guides/ews-streaming-notifications-graphhttps://sunsetless.com/guides/ews-streaming-notifications-graphSat, 03 Oct 2026 00:00:00 GMTMicrosoft Graph has webhooks and delta queries and no streaming connection. How EWS pull, push and streaming subscriptions map to Graph. https://sunsetless.com/guides/ews-to-graph-differenceshttps://sunsetless.com/guides/ews-to-graph-differencesSat, 03 Oct 2026 00:00:00 GMTSending, meetings, search, sync, notifications, IDs and time: where Microsoft Graph behaves differently from EWS, measured on live Exchange Online. https://sunsetless.com/guides/hybrid-exchange-one-code-basehttps://sunsetless.com/guides/hybrid-exchange-one-code-baseSat, 03 Oct 2026 00:00:00 GMTA product with customers on Exchange Server and Exchange Online needs EWS for one group and Microsoft Graph for the other. Three ways to build it.