# 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 2026-11-12 by Rewindex: what changed on SparkPost’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/r7506228251f9a0
Last updated: 2026-11-12T21:43:37Z

**Summary:** _summary pending_
- Kind: Incident update · Label: not classified yet
- Changed: 2026-11-12 21:43 UTC · Detected: 2026-11-12 21:43 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@c3411f4fd112 → after incident\_version:755/37r4xk532jd6@c512f361edc1
- Change 1 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) · 2026-11-12 21:37 UTC

```diff
+ We're still monitoring the Microsoft incident (EX1550543). Delivery to Outlook.com, Hotmail, Live, MSN and Office 365 recipients is still heavily delayed, and we haven't seen a meaningful improvement yet. Microsoft says it has found a way to bring a test group of its affected servers back into service and is now rolling that fix out more widely. It is also restarting servers that stop responding. Delivery may improve gradually as that rollout continues, and Microsoft expects to post its next update by 22:30 UTC. You can follow it at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost is still queuing and retrying affected messages automatically, and some continue to get through on a retry. Please don't resend them. Messages with a short expiration time may still expire before Microsoft accepts them.
```

## 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 (this change) |  |
| 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](https://rewindex.com/change/r4c3527cb8810d5.md) |  |

Next: [change](https://rewindex.com/change/r403c7e39cf13b3.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 2026-11-12 21:43 UTC (change 1 of 6).

- Canonical URL: https://rewindex.com/change/r7506228251f9a0
- Citation: SparkPost, “Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365” (2026-11-12 21:43 UTC). Archived by Rewindex: https://rewindex.com/change/r7506228251f9a0 (CC BY 4.0).
- Markdown link: `[SparkPost: Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365 (2026-11-12)](https://rewindex.com/change/r7506228251f9a0)`


---
Canonical: https://rewindex.com/change/r7506228251f9a0 · Markdown: https://rewindex.com/change/r7506228251f9a0.md · JSON: https://rewindex.com/api/v1/changes/r7506228251f9a0 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-13T04:06:08.187Z