# 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/r403c7e39cf13b3
Last updated: 2026-11-12T22:33:38Z

**Summary:** _summary pending_
- Kind: Incident update · Label: not classified yet
- Changed: 2026-11-12 22:33 UTC · Detected: 2026-11-12 22:33 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@c512f361edc1 → after incident\_version:755/37r4xk532jd6@b1a68e50abcd
- Change 2 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 22:26 UTC

```diff
+ We're still monitoring 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. In its latest update, Microsoft said its earlier recovery steps did not bring the expected relief. It has traced the problem to a core process on its servers that is becoming overwhelmed. Microsoft is now isolating part of its infrastructure, restarting it and slowly bringing traffic back to test a recovery approach before applying it more widely. It has not given a time for recovery, and its next update is expected by 23:30 UTC. You can follow it at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost's systems are working normally. We're still queuing messages to Microsoft and retrying them automatically, and some continue to get through on a retry. Please don't resend affected messages, because that will create duplicates once the queued mail is delivered. Because this has now lasted several hours, messages with an expiration time of up to a few hours may also expire before Microsoft accepts them, not only very short ones. You'll get a bounce event for each expired message.
```

## 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 (this change) |  |
| 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) |  |

Previous: [change](https://rewindex.com/change/r7506228251f9a0.md) · Next: [change](https://rewindex.com/change/rb58b9a0cad2e69.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 22:33 UTC (change 2 of 6).

- Canonical URL: https://rewindex.com/change/r403c7e39cf13b3
- Citation: SparkPost, “Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365” (2026-11-12 22:33 UTC). Archived by Rewindex: https://rewindex.com/change/r403c7e39cf13b3 (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/r403c7e39cf13b3)`


---
Canonical: https://rewindex.com/change/r403c7e39cf13b3 · Markdown: https://rewindex.com/change/r403c7e39cf13b3.md · JSON: https://rewindex.com/api/v1/changes/r403c7e39cf13b3 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-13T04:05:34.249Z