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Microsoft Outlook and Other Services Experience Major Outage Today, Affected Enterprises Can Apply for Fee Credits
IT之家 November 13 news: The tech media outlet Windows Latest published a blog post today (November 13), reporting that in response to the widespread and prolonged outage of Microsoft 365 office services, fee credits will be provided to affected enterprise customers who submit applications, but individual users are unlikely to receive compensation.
According to Microsoft's official notice MO1550821, this Microsoft 365 service outage began at around 13:25 Eastern Time on November 12, 2026 (IT之家 note: around 2:25 a.m. Beijing Time on November 13), affecting multiple Microsoft services including Outlook, Teams, Copilot, and OneDrive.
Regarding the root cause, Microsoft Executive Vice President Charles 拉曼纳 (Charles Lamanna) said there is currently no indication or evidence that the issue was caused by a malicious cyberattack. After initial investigation, the company believes the increased load was not caused by a surge in traffic, but mainly by some servers becoming unexpectedly unavailable, which put pressure on the remaining infrastructure. The company has taken measures including pausing deployments, freeing memory, adjusting traffic routing, and restarting servers.
Regarding compensation, affected enterprise customers may apply for fee credits under the Service Level Agreement (SLA). According to the April 2026 version of the agreement, when Exchange Online's monthly availability falls below 99.9%, 99%, and 95%, the corresponding credit percentages are 25%, 50%, and 100%, respectively.
However, the credit tier mainly depends on how many "user minutes" the organization's Exchange Online lost during the month, which can be roughly simplified as "number of affected users × outage minutes." Assuming November (30 days, 43,200 minutes) runs around the clock and the service affects all users, the relevant compensation is as follows:
| Monthly availability threshold | Proportion of unavailable time | Corresponding downtime when all users are affected | Credit percentage after falling below the availability threshold |
|---|---|---|---|
| 99.9% | 0.1% | 43.2 minutes, i.e., 43 minutes 12 seconds | 25% |
| 99% | 1% | 432 minutes, i.e., 7 hours 12 minutes | 50% |
| 95% | 5% | 2,160 minutes, i.e., 36 hours | 100% |
Customers who order directly from Microsoft can submit an application through the admin center, attaching the incident number MO1550821 or EX1550543, and retaining error screenshots, the number of affected people, and the start and end times; customers who purchased through resellers should contact their supplier.
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