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Outlook | Outlook for mobile | Outlook for iOS | For home
Using Outlook for iOS for personal email and calendar management
Submit an in-app support case with diagnostics from new Outlook and Outlook mobile, because both affected clients synchronize a Microsoft-hosted copy of the Gmail mailbox while Gmail web and classic Outlook remain current.^1^
Escalate with server-side evidence
A public Microsoft incident specifically covering Gmail synchronization stopping on October 18, 2026 is not currently documented on the public status page.^2^ This therefore needs an account-specific support investigation.
- In new Outlook for Windows, select Help > Support.
- Select the account through which you are eligible for support, accept the privacy statement, and submit the case.
- Open Help > Get Diagnostics, then select Upload Logs or Send Diagnostics when requested by the support agent. New Outlook’s support workflow can attach diagnostic information needed for investigation.^3^
- In Outlook mobile, open its in-app Contact Support option and reference the same case. Microsoft documents Contact Support as the route for Outlook mobile issues.^4^
- Include:
- Gmail address, redacted in any public post.
- Exact last known successful synchronization time, including time zone.
- A Gmail message received after the cutoff, with its timestamp and subject.
- New Outlook version/build and mobile app versions.
- iOS/Android version and device model.
- Confirmation that Gmail web and classic Outlook receive the same test message.
- Confirmation that new Outlook and mobile stop at the identical timestamp.
- Whether sending, moving, deleting, read status, calendar, and contacts are also affected.
Ask support to inspect:
- Google OAuth authorization/refresh-token state held by Microsoft.
- Last successful inbound synchronization and subsequent connector errors.
- Throttling or disabled synchronization state.
- Incremental synchronization cursor/checkpoint.
- Microsoft Cloud mailbox-copy health.
- Account-specific incidents or telemetry correlation.
- Reprovisioning of the Gmail cloud connection if its server-side state is stale.
This pattern is consistent with the shared cloud path: Microsoft states that new Outlook, Outlook for iOS, and Outlook for Android synchronize a copy of non-Microsoft mailbox data between the provider and Microsoft data centers.^1^ It does not, by itself, establish whether the fault is OAuth, throttling, or a damaged checkpoint; Microsoft support must determine that from service telemetry.
Optional self-service connector reprovisioning
If no support investigation is already active, an account-wide removal and reauthorization is the closest available self-service reprovisioning action. Back up drafts, calendar entries, contacts, or other changes that exist only in Outlook first. Microsoft warns that Remove from all devices deletes the Microsoft Cloud data across Outlook clients, and cloud-only items may be permanently lost.^5^
- Close new Outlook.
- In the Google Account website, open Security > Your connections to third-party apps and services.
- Remove Microsoft apps and services to revoke the existing authorization.
- In new Outlook, open View > View settings > Accounts > Your accounts.
- Select Manage beside the Gmail account, then Remove.
- Select Remove from all devices, not only this device.
- Restart new Outlook and add the Gmail account again through Accounts > Your accounts > Add account.
- Complete Google sign-in and select Allow for Microsoft’s requested permissions.^6^
- Test a newly received message plus read/unread, move, and delete operations in both new Outlook and mobile.
A closely matching new Outlook case used revocation, account removal, and fresh Google authorization to recreate the Gmail connection.^7^ If synchronization remains frozen at the same timestamp afterward, stop repeating client reinstalls or local cache resets and update the support case with the reconnection time and fresh diagnostics.
References
- Sync your account in Outlook to the Microsoft Cloud
- Microsoft service health status
- Contact support and provide feedback in new Outlook for Windows | Microsoft Support
- Can't sync calendar and contacts with my phone or tablet | Microsoft Support
- [New Outlook](https://support.microsoft.com/outlook/getstarted/add-an-email-account-to-outlook-for-windows#remove-an-account-in-new-outlook)
- Add a Gmail account to Outlook for Windows | Microsoft Support
- Gmail account stopped syncing in both directions with New Outlook - Microsoft Q&A