Outage in Microsoft 365
Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods
Minor
March 19, 2026 - Started 1 day ago
Incident Report
Title: Some users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps
User impact: Users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
More info: This issue impacts both the Android and iOS mobile app experiences.
Current status: We're analyzing Outlook mobile logs to isolate the root cause of impact and establish a fix.
Scope of impact: Impact may occur for some users intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Next update by: Thursday, March 19, 2026, at 4:30 PM UTC
Components affected
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Latest Updates ( sorted recent to last )
about 11 hours ago - at 03/20/2026 05:36PM
Title: Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods
User impact: Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.
More info: This issue may intermittently impact some users who are attempting to access the Exchange Online service through the Outlook mobile apps or the new Outlook for Mac desktop client.
Current status: While we’ve previously identified that restarting the affected infrastructure isn’t a sufficient fix for this issue on a wide scale; we've confirmed that it does provide immediate temporary relief. We're continuing to implement the temporary fix as needed while we test a possible long-term solution to resolve the underlying issue for all impacted users. Furthermore, we're performing a deeper analysis into understanding the specifics of the root cause, and we'll provide further details once they are identified.
Scope of impact: Impact may occur for some users intermittently and users may be unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Start time: Thursday, March 12, 2026, at 12:00 AM UTC
Next update by: Saturday, March 21, 2026, at 7:00 PM UTC
1 day ago - at 03/19/2026 10:18PM
Title: Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods
User impact: Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.
More info: This issue may intermittently impact some users who are attempting to access the Exchange Online service through the Outlook mobile apps or the new Outlook for Mac desktop client.
Current status: We’ve identified that restarting the affected infrastructure isn’t a sufficient fix for this issue and we’re continuing our investigation to identify and validate an appropriate remediation action. Once available, we’ll provide a timeline for resolution.
Scope of impact: Impact may occur for some users intermittently and users may be unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Start time: Thursday, March 12, 2026, at 12:00 AM UTC
Next update by: Friday, March 20, 2026, at 6:30 PM UTC
1 day ago - at 03/19/2026 05:58PM
Title: Some users may be intermittently unable to access their Exchange Online mailboxes in some connection methods
User impact: Users may be intermittently unable to access their Exchange Online mailboxes in some connection methods.
More info: This issue may intermittently impact some users who are attempting to access the Exchange Online service through the Outlook mobile apps or the new Outlook for Mac desktop client.
Current status: We've identified that a recent change within the Exchange Online service intended to introduce a new virtual account resulted in impact. To remediate this, we’re restarting the affected infrastructure and monitoring the progression to ensure successful resolution.
Scope of impact: Impact may occur for some users intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Start time: Thursday, March 12, 2026, at 12:00 AM UTC
Root cause: A recent change within the Exchange Online service intended to introduce a new virtual account resulted in impact.
Next update by: Thursday, March 19, 2026, at 11:30 PM UTC
1 day ago - at 03/19/2026 04:19PM
Title: Some users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps
User impact: Users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
More info: This issue impacts both the Android and iOS mobile app experiences.
Current status: We’re continuing our review of Outlook mobile logs and service telemetry to isolate the source of the issue and determine appropriate remediation actions.
Scope of impact: Impact may occur for some users intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Next update by: Thursday, March 19, 2026, at 6:30 PM UTC
1 day ago - at 03/19/2026 02:23PM
Title: Some users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps
User impact: Users may be intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
More info: This issue impacts both the Android and iOS mobile app experiences.
Current status: We're analyzing Outlook mobile logs to isolate the root cause of impact and establish a fix.
Scope of impact: Impact may occur for some users intermittently unable to access their Exchange Online mailboxes with the Outlook mobile apps.
Next update by: Thursday, March 19, 2026, at 4:30 PM UTC
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