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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesMigrate an EWS app by first confirming it targets Exchange Online, then inventorying the EWS operations it actually uses, mapping each operation to Microsoft Graph or a deliberate alternative, and updating the app’s identity, permissions, and workflows. Treat Microsoft’s API mappings as a starting point—not proof of full feature parity—and test the app’s real behavior before cutover.
Check whether Graph is the right target
Microsoft recommends Microsoft Graph for applications that access Exchange Online data. Graph is not supported for Exchange on-premises; Microsoft’s migration overview applies to Exchange Online and hybrid deployments, not to an app that must connect to an on-premises Exchange server. Confirm the app’s actual deployment and mailbox targets before planning a Graph rewrite. Microsoft’s EWS migration overview explains the supported scope, and its Exchange development guidance recommends Graph for new applications accessing Exchange Online data.
Microsoft says Exchange Online EWS global disablement begins in October 2026 and will be complete in April 2027. These are rollout dates, not a claim that every tenant loses access on the same day in October. Check Microsoft’s live EWS deprecation page for current status and roadmap estimates, which Microsoft warns may change.
Plan the migration around actual EWS behavior
Do not start by translating method names mechanically. Identify which EWS operations run in production, which mailboxes and users they affect, and what the app expects each operation to do. A rarely used code path can still be business-critical, while an apparent one-to-one API match may differ in behavior, data, or permission requirements.
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- Set the boundary. Record whether the app accesses Exchange Online, a hybrid environment, or on-premises Exchange. If it must access on-premises Exchange, Graph is not a supported replacement for that connection.
- Inventory operations in use. Inspect the code and configuration for EWS calls and identify the active app instances and affected mailboxes. Include mail, calendar, folders, synchronization, notifications, and utility operations—not just the most visible user-facing feature.
- Map each requirement. Use Microsoft’s EWS-to-Graph API mapping guide as a cross-reference. For each call, verify that Graph exposes the fields and behavior the app needs. Record any workflow change or unresolved gap rather than marking the call “migrated” solely because the guide names a corresponding API.
- Redesign identity and access. Choose delegated or application access based on how the app operates, then grant only the required Graph permissions and configure appropriate consent and mailbox access controls.
- Replace unsupported capabilities. Where Microsoft says Graph will not provide an equivalent, select a supported alternative workflow or revise the requirement before removing EWS.
- Validate and stage cutover. Test the app’s actual operations in the target tenant, then move traffic in a controlled way suited to the application. Microsoft’s reviewed guidance does not prescribe one universal cutover sequence, so base the rollout and recovery plan on your app’s deployment model.
Map EWS operations without assuming full parity
Microsoft’s mapping guide covers selected utility, mail, calendar, and groups APIs. The examples below show the kinds of correspondences it lists; they are not a guarantee that every EWS option, property, or edge case is supported in the same way.
| EWS operation or pattern | Graph direction in Microsoft’s mapping guide | Migration consideration |
|---|---|---|
Mail: FindItem, GetItem |
List messages; get a message | Check the query, returned properties, and handling of results the app relies on. |
Mail: CreateItem, MoveItem, SendItem |
Create a message; move a message; send a message or use send mail | Validate the app’s compose, move, and send workflows rather than assuming identical semantics. |
Synchronization: SyncFolderHierarchy, SyncFolderItems |
Mail folder delta; messages delta | Rework synchronization around the Graph delta pattern and verify how the app handles changes and continuation state. |
Notifications: EWS push Subscribe/Unsubscribe |
Create/delete a Graph subscription | Subscriptions are for push notifications. EWS pull-notification scenarios point instead toward messages delta, so this can require an architectural redesign. |
Availability: GetUserAvailability, FindAvailableMeetingTimes |
Get free/busy schedule | Check the required availability and calendar-sharing scenarios against the specific Graph behavior needed. |
Utilities: ConvertId, ResolveNames, GetServerTimeZones |
Translate Exchange IDs; list people; get time zone choices | Confirm that the mapped operation returns the identifiers or choices expected by downstream code. |
For each row your app uses, compare inputs, outputs, permissions, and failure handling. Microsoft’s mapping reference should be read alongside its parity roadmap and deprecation notes; a named mapping does not mean that all EWS capabilities have a Graph equivalent.
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Update authentication and mailbox permissions
Both EWS and Graph use OAuth 2.0 through the Microsoft identity platform and support delegated and application permission types, but the access models are not interchangeable. Microsoft details the differences in its EWS and Graph authentication guide.
- Use delegated access when the app acts in the context of a signed-in user. Its access follows what that user can access.
- Use application access when the app runs as itself, such as a background service. In this model, the app uses its own identity and client credentials; Microsoft says Graph has no service accounts.
- Reassess mailbox scope. EWS application access and service-account impersonation patterns do not carry over directly. Graph offers more granular mailbox-feature permissions, such as mail permissions without calendar or contacts access. Admin consent can grant broad access, and administrators can limit an app’s access to specific mailboxes. Model the effective scope deliberately and grant only what the app needs.
- Use OAuth 2.0 for Graph. Graph does not support Basic authentication, so an EWS app relying on Basic authentication cannot keep that authentication method when moving to Graph.
Account for capabilities that need a different plan
Microsoft’s deprecation page distinguishes roadmap items from capabilities it says will not be added to Graph. Roadmap dates are estimates and may change; do not make a cutover depend on an item arriving by a particular date unless the live Microsoft page still supports that assumption.
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Roadmap items to verify
As listed on the reviewed deprecation page, roadmap areas include archive, public-folder and group import/export; in-place archive access; mailbox notes; Exchange Admin API capabilities; sovereign-cloud availability; report-message support; non-draft MIME create/update; user-configuration objects; contact lists and properties; and marking all folder items read. Several entries had Q3 or Q4 calendar-year 2026 target estimates. Check the current page for each item’s status and timing before using it in a migration decision.
Gaps Microsoft says will not be added to Graph
- Generic Public Folder create, read, update, and delete (CRUD). Public Folder import/export is listed separately as a roadmap item; that does not provide generic CRUD parity.
- Generic Microsoft 365 Group mailbox folder or item CRUD. Microsoft points to supported Graph group conversations, threads, and posts instead. Group mailbox import/export is a separate roadmap item.
- Generic access to legacy Discovery Mailboxes. Microsoft points to Microsoft Purview eDiscovery APIs and workflows for supported discovery capabilities.
For another uncovered EWS operation, the reviewed Microsoft guidance does not establish a universal substitute. Validate the requirement with the relevant Microsoft service documentation or the vendor responsible for the app before committing to a replacement design.
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Test the behavior that matters before cutover
Build tests from the inventory, not just from the API mapping table. At minimum, exercise every operation the app uses and its relevant identity context in a non-production or otherwise controlled tenant.
- Confirm the intended mail, calendar, folder, and availability workflows, including the properties and identifiers the app consumes.
- Exercise synchronization across initial and subsequent changes, and verify the app’s handling of delta state, retries, and failures.
- Test push-subscription creation and deletion if the app uses notifications; test the delta-based redesign if it previously relied on EWS pull notifications.
- Verify delegated behavior for a signed-in user and application behavior for the app identity, including mailbox scope and consent.
- Check unsupported or roadmap-dependent requirements explicitly; do not treat a successful test of common mail operations as evidence that unrelated EWS features are covered.
Once these checks pass, stage the Graph implementation according to the app’s operational risk and deployment model. Define how to observe errors and how to recover if a required behavior fails; the precise rollout mechanism depends on the application and is not standardized by Microsoft’s migration overview.
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