Microsoft’s retirement of Exchange Web Services (EWS) is no longer a distant roadmap item. Enforcement has started rolling out across Microsoft 365 tenants, and the service is scheduled to be switched off permanently on 1 April 2027. For organisations using CloudM Migrate for Microsoft 365 projects, that makes migration readiness a task to put on the calendar now.
CloudM’s support update of 30 October 2026 explains that some Microsoft 365 workloads in CloudM Migrate still use EWS. The company is moving those connectors to Microsoft Graph, but that work is not generally available yet. In the meantime, customers need to make sure the CloudM application is permitted to use EWS in each affected tenant.
What is changing with EWS?
Microsoft is moving Exchange Online integrations away from EWS and towards Microsoft Graph. The change is being enforced progressively rather than on one single date for every tenant. From October 2026, Microsoft began setting EWS to disabled in tenants where it had not been explicitly configured. It also introduced an application allow-list model, so simply setting EWS to enabled is no longer enough once enforcement reaches a tenant.
From 1 April 2027, EWS will be fully disabled in Exchange Online. No tenant setting or allow-list entry will keep it working after that date. If a migration project depends on an EWS-based workload, the team needs a tested plan well before the cut-off.
Which CloudM Migrate workloads could be affected?
CloudM says the change affects Microsoft 365 migrations involving mail, calendars, contacts, tasks and notes where the current connector uses EWS. The impact depends on the workloads in scope, the tenant’s EWS configuration and whether the CloudM application registration is already on the relevant allow list.
There is one important detail for IT teams: Microsoft may have created an allow list based on applications that used EWS in the previous 60 days. Apps that are used infrequently, or were created more recently, may not be included automatically. A migration that worked during an earlier test is not proof that every production tenant is ready.
What should Singapore IT teams do now?
- Inventory active migration projects. Identify every Microsoft 365 tenant and workload that relies on CloudM Migrate, including mail, calendar, contact, task and note data.
- Check the tenant’s EWS settings. Confirm whether Microsoft’s enforcement has reached the tenant and whether an application allow list is in place. Do not rely on the legacy EWS-enabled setting alone.
- Allow-list the CloudM application. Follow CloudM’s current guidance to add its Migrate app registration to Microsoft’s EWS allow list for the affected tenant. Have the Microsoft 365 administrator verify the application ID and policy change.
- Allow time for the change to take effect. CloudM advises allowing up to 24 hours after updating the allow list before testing the migration again.
- Run a representative test. Validate each workload, check data counts and permissions, and confirm that the migration can complete within the planned change window.
- Keep the Graph transition on the roadmap. Ask your migration partner to confirm when Microsoft Graph support for the required workloads becomes generally available and what version or configuration will be needed.
Plan migration windows around the deadline
For Singapore organisations, the risk is not just a failed connector. A migration can affect staff access, project deadlines and business operations, especially when email and collaboration data are being moved between tenants. Build the EWS check into the project plan, schedule a test before the production cutover, and make sure the Microsoft 365 owner and migration partner agree on who is responsible for the allow-list change.
It is also worth checking how the migration handles data governance. Confirm where migration data is processed, who can access it, how temporary copies are protected and how exceptions are recorded. These questions matter for organisations handling personal data, confidential customer information or regulated business records under Singapore’s PDPA and internal security policies.
Do not leave the check until the final cut-off
CloudM’s guidance gives customers an interim way to keep affected migrations running while its Microsoft Graph work progresses. That is useful, but it should not become a reason to postpone planning. Tenant-by-tenant enforcement has already begun, and the April 2027 retirement date is fixed.
If your organisation is planning a Microsoft 365 migration, ask your IT team or CloudM partner to review the EWS dependency now. A short compatibility check, allow-list review and controlled test can help prevent a last-minute disruption when the migration window matters most.
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