Microsoft 365 customers may be able to claim a service credit after the outage, but the remedy depends on their own measured impact and contract, not the global outage duration. The credit, if approved, applies to affected service fees, not necessarily lost business or an entire Microsoft 365 bill.
Microsoft AI Watch analysis
What happened
Open Magazine outlines how Microsoft’s Exchange Online service-level agreement sets a 99.9% monthly availability commitment. It says the published credit bands are 25% when availability falls below 99.9%, 50% below 99% and 100% below 95%. Those percentages apply to the monthly fee for the affected service.
The article stresses that customers need to establish how their own tenant was affected. Its account says Microsoft measures Exchange downtime in user-minutes, so a worldwide outage lasting a given number of hours does not mean every customer or licensed user experienced that full interruption. The incident references it identifies are EX1550543 for Exchange Online and MO1550821 for broader Microsoft 365 impact.
Why it matters
A service credit is not the same as compensation for delayed work, missed sales or idle staff. Open Magazine says the remedy is generally a credit against applicable service fees, and that Microsoft’s terms describe service credits as the sole and exclusive remedy for service-availability failures under the SLA. The practical value may therefore be much smaller than the disruption’s business cost.
For customers using Microsoft’s Cloud Solution Provider programme, the article says partner guidance asks for evidence including the tenant GUID, incident identifier, affected users and locations, timing, duration and attempts to resolve the issue. It says the filing deadline for non-Azure services is one month after the end of the billing month containing the incident. Customers buying through a partner generally need to ask that provider to file.
Our read
The useful takeaway is to check the contract and gather tenant-specific evidence, rather than assuming the headline outage duration guarantees a credit. Microsoft’s published bands give businesses a framework, but eligibility and the amount depend on the applicable agreement and measured impact. A credit may soften an invoice; it cannot put the missed meeting back on the calendar.
What to watch
- Whether Microsoft publishes a post-incident report and clarifies the measured impact.
- Whether customers or partners report how the claims process works in practice.
- Which service commitments apply to customers’ specific Copilot and Microsoft 365 licences.
Discussion spark: Should cloud service contracts offer compensation for the business losses an outage causes, or is a service credit against the affected subscription a fair limit?
Sources and evidence
- Microsoft 365 Was Down for Hours. Can Your Company Get Its Money Back? – Open Magazine (13 November 2026, 11:41 UTC)
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