# SparkPost: Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365

> Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365. Detected 2026-11-13 by Rewindex: what changed on SparkPost’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/r4c3527cb8810d5
Last updated: 2026-11-13T03:23:46Z

**Summary:** _summary pending_
- Kind: Incident update · Label: not classified yet
- Changed: 2026-11-13 03:23 UTC · Detected: 2026-11-13 03:23 UTC
- [Source: https://status.sparkpost.com/incidents/37r4xk532jd6](https://status.sparkpost.com/incidents/37r4xk532jd6)
- [Company: SparkPost](https://rewindex.com/company/sparkpost.md)
- Versions: before incident\_version:755/37r4xk532jd6@9c652a370cf9 → after incident\_version:755/37r4xk532jd6@9e8a677f0825
- Change 6 of 7 for this incident

Incident page (full timeline): [Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/company/sparkpost/incidents/37r4xk532jd6.md)
## What changed

**1. Added: Update** (identified) · 2026-11-13 03:19 UTC

```diff
+ Microsoft reports that the changes it applied to restore service are not working as expected, and it is pursuing other ways to add capacity. Delivery to Outlook.com, Hotmail, Live, MSN and Office 365 recipients remains significantly delayed, and about two-thirds of delivery attempts to Microsoft are still being deferred. Microsoft has not given an estimated time for recovery. The incident is tracked as EX1550543, and Microsoft's updates are at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost's systems are working normally. Messages still waiting for Microsoft remain queued and are being retried automatically. Please don't resend them, because that will create duplicates once they're delivered. The problem has now lasted nearly ten hours, so messages with expiration times of several hours or more may expire before Microsoft accepts them. Each expired message generates a bounce event, and since expired messages are no longer queued, you can decide whether to resend those.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-11-12 21:43 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/r7506228251f9a0.md) |  |
| 2026-11-12 22:33 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/r403c7e39cf13b3.md) |  |
| 2026-11-13 00:03 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/rb58b9a0cad2e69.md) |  |
| 2026-11-13 01:13 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/reff26e71f2a8e5.md) |  |
| 2026-11-13 03:13 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/r76cb3ac7c22169.md) |  |
| 2026-11-13 03:23 UTC | Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365 (this change) |  |
| 2026-11-13 04:53 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/re736512abe8437.md) |  |

Previous: [change](https://rewindex.com/change/r76cb3ac7c22169.md) · Next: [change](https://rewindex.com/change/re736512abe8437.md) · All SparkPost changes: [timeline](https://rewindex.com/company/sparkpost/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._

## Cite this

Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365 on SparkPost’s status page, changed 2026-11-13 03:23 UTC (change 6 of 7).

- Canonical URL: https://rewindex.com/change/r4c3527cb8810d5
- Citation: SparkPost, “Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365” (2026-11-13 03:23 UTC). Archived by Rewindex: https://rewindex.com/change/r4c3527cb8810d5 (CC BY 4.0).
- Markdown link: `[SparkPost: Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365 (2026-11-13)](https://rewindex.com/change/r4c3527cb8810d5)`


---
Canonical: https://rewindex.com/change/r4c3527cb8810d5 · Markdown: https://rewindex.com/change/r4c3527cb8810d5.md · JSON: https://rewindex.com/api/v1/changes/r4c3527cb8810d5 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-13T05:16:35.756Z