Direct answer
Check Microsoft’s public service-health status and, for work or school accounts, the Microsoft 365 admin center’s Health › Service health page. If no incident is shown, compare web and desktop apps before repairing Office or changing the account.
What this covers
- Microsoft 365, Outlook, Teams or OneDrive availability questions
- Current supported consumer software as reviewed on August 20, 2026
- The symptom described in the title before a factory reset or hardware repair
What it does not cover
- ×A live service claim mirrored by Home Product Support or tenant health hidden from non-admin users
- ×Billing, ownership, warranty or account-recovery disputes
- ×Regional features that the manufacturer does not list for your country
Check Microsoft’s public status
ReversibleOpen the public status page and identify whether the named cloud service has a current incident.
Check tenant health if authorized
ReversibleA Microsoft 365 administrator can open Health › Service health for tenant-specific advisories.
Compare web and desktop apps
ReversibleIf the web app works but the installed app fails, focus on that local app instead of the whole service.
Restart or repair only after status is clear
ReversibleRestart the app and device. Use Microsoft’s app repair flow only when the provider reports no relevant incident.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I try first for is microsoft 365 down or is the problem local??+
Open the public status page and identify whether the named cloud service has a current incident.
Will these steps erase apps, files or settings?+
No data-erasing step is required in this sequence. Do not reinstall Office or remove an account during a confirmed service incident. Local repair can reset app preferences.
When should I stop troubleshooting?+
Stop if the device reports hardware damage, becomes unusually hot, smells burnt, or the problem falls into this excluded case: A live service claim mirrored by Home Product Support or tenant health hidden from non-admin users.
Answer for the exact device and software version shown above.