Users may be unable to access their mailbox using any connection methods

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: The expedited configuration change has reached about 65 percent of affected infrastructure. We’re continuing to see a sharp increase in service availability worldwide as the deployment continues. We’re closely monitoring progress and anticipate full saturation, by Thursday, July 10, at 7:00 PM UTC.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 7:30 PM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We’ve begun a broad expedited deployment of the configuration change across all affected infrastructure. We expect most impacted users will experience relief within the next two hours, as the fix saturates the environment. We’re closely monitoring service health telemetry to ensure the recovery continues as expected. We understand how impactful incidents of this type can be, and we're continuing to open any additional workstreams to expedite recovery and restore availability.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 6:30 PM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We're continuing to apply the configuration changes to fix the underlying problem and completing additional validation efforts to ensure authentication components are properly configured. In parallel to the current deployment of the configuration change fix, we're reviewing options to leverage an expedited deployment methodology in regions which are experiencing the highest levels of impact to provide the most effective relief where possible.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 4:30 PM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We’ve identified an issue with the fix. We’re applying configuration changes, restarting affected components and additional validations are underway to confirm that authentication components are properly configured.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 2:00 PM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: Our deployment of the fix is progressing quicker than anticipated and we expect impact to gradually mitigate as it progresses. We believe the issue will be resolved by our next update time.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 10:30 AM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We've determined the cause of the issue and have started deployment of a fix. We expect the fix to take an extended period following our safe change management process.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 11:30 AM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: Our investigation into the authentication issue is ongoing. We're further assessing the impact scenario to help inform our next steps to resolve impact.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 5:30 AM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We're continuing to investigate the impacted mailbox infrastructure and suspect an issue with an authentication component may be causing impact. We're further investigating the affected component to inform our next steps.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 3:30 AM UTC

Title: Users may be unable to access their mailbox using any connection methods
User impact: Users may be unable to access their mailbox using any connection methods.
More info: Impacted connection methods include, but may not be limited to:
- Outlook.com
- Outlook Mobile
- Outlook desktop client
Current status: We've identified that users may be unable to access their mailboxes using any connection method. We've determined that a portion of mailbox infrastructure isn't performing as efficiently as expected, resulting in impact. We're investigating this further to better understand the issue and help inform our next troubleshooting steps.
Start time: Wednesday, July 9, 2025, at 10:20 PM UTC
Next update by: Thursday, July 10, 2025, at 1:30 AM UTC