Status Page

O365 - Email/Outlook

2024-04-16	Status	Description
02:17 PM		Some users' quarantine notifications may not be received in their configured mailbox language in Exchange Online ID: EX764043 Issue type: Advisory Status Service Restored Impacted services Exchange Online Details Title: Some users' quarantine notifications may not be received in their configured mailbox language in Exchange Online User impact: Users' quarantine notifications may not have been received in their configured mailbox language in Exchange Online. More info: Affected users may have incorrectly seen that all quarantine notifications were being received in English when their mailbox has a different language configured. Final status: Deployment of the fix is complete, and we've monitored service health telemetry to confirm that quarantine notifications are now received in the correct language and impact is remediated. Scope of impact: Impact was specific to some users with quarantine notifications enabled who were served through the affected infrastructure. Start time: Thursday, March 21, 2024, at 1:00 PM UTC End time: Monday, April 15, 2024, at 8:00 AM UTC Root cause: A recent service update to the code base responsible for identifying the user's language when sending quarantine notifications introduced a code regression that led to impact. Next steps: - We're reviewing our Exchange Online update procedures pertaining to the code base responsible for identifying users' language configurations to prevent similar impact in future updates. This is the final update for the event.
02:13 PM		Some users may experience delays of up to five minutes accessing Outlook on the web and its features ID: EX766938 Issue type: Advisory Status Service Restored Impacted services Exchange Online Details Title: Some users may experience delays of up to five minutes accessing Outlook on the web and its features User impact: Users may have experienced delays of up to five minutes accessing Outlook on the web and its features. Final status: We've confirmed that the fix has completed deployment and validated this has remediated impact via service telemetry. Scope of impact: Some users whose requests were routed through the affected subset of infrastructure may have seen delays when accessing Outlook on the web or leveraging its features. Start time: Monday, April 1, 2024, at 1:00 PM UTC End time: Saturday, April 13, 2024, at 3:10 PM UTC Root cause: A recent infrastructure update deployed a code change to an authentication component, which was causing the component to consume more resources than the infrastructure can handle, resulting in impact. Next steps: - We're continuing our review of the code responsible for impact to better identify and prevent similar issues in the future. This is the final update for the event.
02:09 PM		Users may be intermittently unable to download attachments or view embedded images in Outlook on the web ID: EX776161 Issue type: Incident Status Service Restored Impacted services Exchange Online Details Title: Users may be intermittently unable to download attachments or view embedded images in Outlook on the web User impact: Users may have been intermittently unable to download attachments or view embedded images in Outlook on the web. More info: Users may have seen the following error message when an attachment failed to download: “Error downloading the file content.” This issue may have impacted those who were downloading attachments or viewing embedded images in Outlook on the web. To ensure the mitigation takes effect, users should log out and then log in to their Outlook on the web accounts. If available, users could have downloaded attachments and viewed embedded images consistently through the Outlook desktop client or the Outlook mobile app. Final status: We've completed the deployment of the fix and service telemetry indicates availability has been restored. Customers have also reported that the issue is resolved. If users are still experiencing the issue, please ensure that they log out and log back in to their devices for the changes to take effect. Scope of impact: Users attempting to download attachments and viewing embedded images in Outlook on the web may have been intermittently impacted. Start time: Friday, March 29, 2024, at 12:00 AM UTC End time: Monday, April 15, 2024, at 2:00 PM UTC Root cause: A recent update that was intended to improve the reliability of Outlook on the web contained a code configuration issue that caused long running sessions, which may have prevented attachment downloads and embedded image viewing. Next steps: - We're reviewing our change management procedures to identify opportunities for improvement with impact scenarios such as this. - We're performing analysis on our automated detections to determine more expedient methods to identify and resolve similar events in the future.

2024-04-15	Status	Description
06:00 PM		Some users' mailbox migrations from Google to Exchange Online haven't completed as expected ID: EX774895 Status Service Degradation Impacted services Exchange Online Details Title: Some users' mailbox migrations from Google to Exchange Online haven't completed as expected User impact: Users' mailbox migrations from Google to Exchange Online haven't completed as expected. More info: Specifically, the Deleted, Archive, and Junk mailboxes are showing a difference in size after the migration. Current status: We've determined that a code issue was introduced in a recent service update which impacts migrations from Google to Exchange Online by not migrating items with the Deleted, Archive, or Junk labels, resulting in mailbox migrations not completing as expected. We've developed a code change and are deploying it to our internal testing environment to ensure it remediates impact. We'll aim to provide a deployment timeline by our next scheduled update. Scope of impact: Your organization is affected by this event, and some users attempting to migrate mailboxes from Google to Exchange Online are impacted. Start time: Thursday, March 7, 2024, at 12:00 AM UTC Root cause: A code issue was introduced in a recent service update which impacts migrations from Google to Exchange Online by not migrating items with the Deleted, Archive, or Junk labels, resulting in mailbox migrations not completing as expected. Next update by: Monday, April 15, 2024, at 6:00 PM UTC
01:41 PM		Some Exchange Online users may intermittently be unable to view free/busy information of Exchange on-premises users ID: EX774628 Status Service Restored Impacted services Exchange Online Details Title: Some Exchange Online users may intermittently be unable to view free/busy information of Exchange on-premises users User impact: Exchange Online users may have intermittently been unable to view free/busy information of Exchange on-premises users. Final status: We've received confirmations from affected users that the issue has been resolved after we reverted the offending configuration change. Scope of impact: This event may have intermittently impacted some users who were attempting to retrieve external users' free/busy information in Exchange Online. Start time: Saturday, March 30, 2024, at 12:00 AM UTC End time: Saturday, April 13, 2024, at 6:45 AM UTC Root cause: A configuration change was causing incorrect results to been returned by a portion of service infrastructure that manages requests sent between Exchange Online and on-premises Exchange Online users. Next steps: - To help prevent similar issues, we're taking steps to ensure that configuration changes go through more extensive testing and validation to help identify problems prior to deployment. This is the final update for the event.
01:33 PM		Some Exchange Online users may intermittently be unable to view free/busy information of Exchange on-premises users Details Title: Some Exchange Online users may intermittently be unable to view free/busy information of Exchange on-premises users User impact: Exchange Online users may intermittently be unable to view free/busy information of Exchange on-premises users. Current status: We've determined a configuration change is causing incorrect results to be returned by a portion of service infrastructure that manages requests sent between Exchange Online and on-premises Exchange Online users. We're reverting the change to remediate the impact and we're assessing a timeline for remediation. Scope of impact: This event may intermittently impact some users who attempting to retrieve external users' free/busy information in Exchange Online. Start time: Saturday, March 30, 2024, at 12:00 AM UTC Root cause: A configuration change is causing incorrect results to be returned by a portion of service infrastructure that manages requests sent between Exchange Online and on-premises Exchange Online users. Next update by: Saturday, April 13, 2024, at 7:00 AM UTC
01:28 PM		Users may be intermittently unable to download attachments or view embedded images in some Outlook connection methods Details Title: Users may be intermittently unable to download attachments or view embedded images in some Outlook connection methods User impact: Users may be intermittently unable to download attachments or view embedded images in some Outlook clients. More info: This issue may impact those who are downloading attachments or viewing embedded images in either Outlook on the web or the Outlook mobile apps. Users may see the following error message when an attachment fails to download: “Error downloading the file content.” Downloading attachments and embedded image viewing may succeed after signing out and then back into Outlook on the web or the Outlook mobile app. If available, users can download attachments and view embedded images consistently through the Outlook desktop client. Current status: We're continuing to track the fix discussed previously in EX764050, and confirmed it's continuing to saturate throughout the affected environment, although the process is taking longer than expected. We expect it may complete by our next scheduled update on Monday, April 15, 2024, at 11:00 PM UTC. Scope of impact: Users attempting to download attachments and viewing embedded images in Outlook on the web or Outlook mobile apps may be intermittently impacted. Start time: Friday, March 29, 2024, at 12:00 AM UTC Root cause: A recent update, intended to improve the reliability of Outlook on the web and Outlook mobile apps, contains a code configuration issue that's causing long running sessions, preventing attachment downloads and embedded image viewing. Next update by: Monday, April 15, 2024, at 11:00 PM UTC