Check Microsoft 365 Service health
Select Health → Service health in the Microsoft 365 admin centre. Your tenant is your organisation’s Microsoft 365 cloud environment. Check EX1550543 for Exchange Online and MO1550821 for the wider outage. If you cannot sign in, use Microsoft’s public cloud status page.
Indian reporting tracked Exchange Online and Teams disruption on 13 November. Record the status shown for your own tenant and give all timestamps in IST (UTC+05:30) or specify another time zone.
Recover mail and keep working
Try Outlook on the web, send and receive a test message with an external address, and check shared mailboxes, the Outbox and nondelivery reports. Ask your administrator for an Exchange Online message trace with sender, recipient, timestamp and message ID.
Use a working phone, independent messaging or a separate CRM login to track customer enquiries. Raise a support ticket for persistent errors after Microsoft marks recovery.
Open a case with your billing provider
If Microsoft invoices you, use Help & support in the Microsoft 365 admin centre. If an Indian CSP reseller invoices you, give it the affected subscription and ask it to file or escalate through its distributor.
Microsoft’s CSP rules give the submitting partner one month after the affected billing month ends. Ask your reseller for its evidence deadline and a case reference. If approved, ask how the credit will appear on the invoice or credit note. Review the applicable direct contract if you buy from Microsoft.
Microsoft partner directory · Use your invoice or the partner relationship in the admin centre to identify your actual licensing provider. Ask it to confirm the claim route and case reference.
Build the evidence for your claim
Include the tenant ID (the GUID shown in the Overview page of the Microsoft Entra admin centre), incident ID, invoice reference, subscription, affected workload and licensed and affected user counts.
Include the time zone, start and end times, errors in Outlook on the web and message traces. Save the Service health notice and support case number. Record consequential business losses separately for review under your contract or insurance.
How much can the credit cover?
Under the standard Exchange Online webmail SLA, monthly uptime below 99.9%, 99% and 95% can qualify for 25%, 50% and 100% credits respectively on eligible fees. The measure accounts for affected user-minutes. Six hours across every user in a 30-day month is about 99.17%. For only one user in ten it is about 99.92%.
Check the separate metrics for mail delay. Record other workloads independently and ask your supplier which SLA terms and eligible fees apply.
Alternatives and continuity
Compare Google Workspace, Zoho Workplace and Proton for Business against shared mail, calendars, data location and retention, mobile access and Excel-dependent workflows.
If remaining on Microsoft 365, test a separately hosted email continuity service with independent sign-in. Plan MX, SPF, DKIM and DMARC records and rollback before any domain migration.