Sending, receiving, and organizing email in Outlook on the web for business
Hello Janice,
I would like to share an update regarding the connectivity issue that you and other users are experiencing with Outlook and multiple Microsoft 365 services.
According to Microsoft's notification (Incident ID: MO1550821), users may currently be unable to connect to or access several Microsoft 365 services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot, and Microsoft Defender XDR.
Microsoft has identified that the affected infrastructure is experiencing widespread impact across multiple regions, affecting mailbox access through Outlook on the web, Outlook desktop (MAPI), and other connections. Technical teams are actively monitoring server performance across regions, reviewing applied patches following infrastructure reboots, and expanding capacity through Virtual Machines to improve service stability and restore full access.
This incident is currently classified as Service Degradation, and Microsoft is treating it with the highest priority and urgency until full resolution is achieved.
If you have Microsoft 365 administrator privileges in your organization, you can sign in to the Microsoft 365 Admin Center to view live details:
- Sign in to the Microsoft 365 Admin Center.
- Go to Health > Service Health.
- Search for Issue ID: MO1550821.
- Select the issue and expand the details to review the latest updates, affected services, impact, and remediation information.
If you are unsure who your organization's administrator is, you can check guidance here: How can I find my Microsoft 365 admin? - Microsoft Support
I will continue to monitor this case closely and keep you updated as soon as new information or a resolution timeline becomes available from Microsoft.
Kind regards,