cannot send or receive emails on any of my devices

An active Microsoft/Outlook service disruption is affecting sign-in and mail flow, so monitor Microsoft’s service status and wait for service restoration rather than reconfiguring each device.^1^

What to do now

1. Open the Service Health Status page using a browser that still has Internet access.
2. Watch for the Outlook/Microsoft 365 status to change from Service degradation or Service interruption to Service restored.
3. Avoid removing accounts, reinstalling Outlook, or changing mail settings on every device. A simultaneous failure for two users across multiple devices, including browser sign-in, is consistent with the reported service disruption.
4. After Microsoft reports recovery, allow some time for service to stabilize, then test:
   • Signing in to Outlook.com.
   • Sending a short message without an attachment.
   • Receiving a message sent from a different email provider.

Microsoft also directs Outlook.com users who cannot access the service to its Service Health Status site.^2^

If access does not return after service restoration

Because the online sign-in has already failed, do not simply repeat it. Use Microsoft’s Sign-in Helper, which checks the account and provides the applicable recovery action.^3^

If sign-in succeeds but mail still cannot be sent or received:

• Check whether Microsoft cloud storage is full. A full allocation prevents both sending and receiving, and incoming messages rejected while it is full are not recoverable from the mailbox.
• Check whether the account was temporarily blocked because of unusual sign-in activity.
• Review forwarding, inbox rules, Junk Email, and the Other tab.^4^

For a work or school Microsoft 365 account, an administrator can check Microsoft 365 admin center → Health → Service health for tenant-specific incidents. If the incident is absent, the administrator can select Report an issue.^5^

References

1. Service Health Status - Microsoft
2. Fixes or workarounds for recent issues on Outlook.com | Microsoft Support
3. I can't sign in to my Microsoft account
4. Can't send or receive email in Outlook.com | Microsoft Support
5. How to check Microsoft 365 service health