# 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/r76cb3ac7c22169
Last updated: 2026-11-13T03:13:37Z

**Summary:** _summary pending_
- Kind: Incident update · Label: not classified yet
- Changed: 2026-11-13 03:13 UTC · Detected: 2026-11-13 03:13 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@3895f0075014 → after incident\_version:755/37r4xk532jd6@9c652a370cf9
- Change 5 of 6 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 03:10 UTC

```diff
+ Delivery to Outlook.com, Hotmail, Live, MSN and Office 365 recipients is improving, but it hasn't fully recovered. Microsoft has restarted affected servers, is adding capacity, and reports that some regions are coming back online. Over the past hour the rate of temporary errors from Microsoft has dropped by about half, and more queued mail is being delivered on retry. Many delivery attempts are still being deferred, so recipients at Microsoft may keep seeing delays for a while. Microsoft is tracking the issue as EX1550543 and posting updates at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost's systems are working normally. Messages still waiting for Microsoft remain queued and will keep being retried automatically. Please don't resend them, because that will create duplicates once they're delivered. Messages whose expiration time passed during the outage have expired and generated a bounce event. They are no longer queued, so 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 (this change) |  |
| 2026-11-13 03:23 UTC | [Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365](https://rewindex.com/change/r4c3527cb8810d5.md) |  |

Previous: [change](https://rewindex.com/change/reff26e71f2a8e5.md) · Next: [change](https://rewindex.com/change/r4c3527cb8810d5.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 03:13 UTC (change 5 of 6).

- Canonical URL: https://rewindex.com/change/r76cb3ac7c22169
- Citation: SparkPost, “Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365” (2026-11-13 03:13 UTC). Archived by Rewindex: https://rewindex.com/change/r76cb3ac7c22169 (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/r76cb3ac7c22169)`


---
Canonical: https://rewindex.com/change/r76cb3ac7c22169 · Markdown: https://rewindex.com/change/r76cb3ac7c22169.md · JSON: https://rewindex.com/api/v1/changes/r76cb3ac7c22169 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-13T04:36:48.072Z