Outage in Microsoft 365
Some users experience errors when attempting to create shared mailboxes in Exchange Online
Resolved Minor
March 20, 2026 - Started about 18 hours ago
- Lasted about 4 hours
Incident Report
Summary AI Generated
Some Microsoft 365 users experienced errors when attempting to create shared mailboxes in Exchange Online, with the service hanging after two-factor authentication and connection issues preventing access to email functions. Users reported inability to load new emails in Outlook and problems connecting to M365 services despite having internet connectivity. Microsoft provided a workaround allowing users to create regular mailboxes and convert them to shared mailboxes while investigating the root cause through HAR log analysis.
Title: Some users experience errors when attempting to create shared mailboxes in Exchange Online
User impact: Users experience errors when attempting to create shared mailboxes in Exchange Online.
As a workaround users are able to create a user mailbox and convert it to a shared mailbox.
Current status: We're analyzing support provided information to determine our next troubleshooting steps.
Scope of impact: Your organization is affected by this event, and some users attempting to create shared mailboxes in Exchange Online may be impacted.
Next update by: Friday, March 20, 2025, at 1:30 PM UTC
Components affected
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Latest Updates ( sorted recent to last )
about 16 hours ago - at 03/20/2026 01:26PM
Title: Some users experience errors when attempting to create shared mailboxes in Exchange Online
User impact: Users experience errors when attempting to create shared mailboxes in Exchange Online.
Current status: We're analyzing HTTP Archive format (HAR) logs to identify the underlying root cause and a mitigation plan.
Scope of impact: Your organization is affected by this event, and some users attempting to create shared mailboxes in Exchange Online may be impacted.
Next update by: Friday, March 20, 2025, at 5:30 PM UTC
about 18 hours ago - at 03/20/2026 11:23AM
Title: Some users experience errors when attempting to create shared mailboxes in Exchange Online
User impact: Users experience errors when attempting to create shared mailboxes in Exchange Online.
As a workaround users are able to create a user mailbox and convert it to a shared mailbox.
Current status: We're analyzing support provided information to determine our next troubleshooting steps.
Scope of impact: Your organization is affected by this event, and some users attempting to create shared mailboxes in Exchange Online may be impacted.
Next update by: Friday, March 20, 2025, at 1:30 PM UTC
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