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User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We’re analyzing service telemetry and investigating reported behavior to determine scope and next steps. Next update by: Monday, April 27, 2026, at 11:30 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Some users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Current status: Our investigation indicates client sign-in scenarios may be contributing to the reported behaviour, and we're focused on validating interactions across service components to identify next steps. Next update by: Monday, April 27, 2026, at 12:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Current status: We’re reviewing a recent change as part of our ongoing investigation and determining next steps. Next update by: Monday, April 27, 2026, at 1:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs.  Current status: We're reverting a recently introduced change to determine if this action provides relief from impact upon completion. In parallel, we're continuing to analyze customer reports, and we're closely monitoring service telemetry to identify our next steps and potential mitigation actions. Next update by: Monday, April 27, 2026, at 2:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We’ve received reports that impact associated with OL1292958 persists. We've resumed our investigation of the issue and are currently analyzing service telemetry and investigating reported behavior to determine scope and next steps. Next update by: Tuesday, April 28, 2026, at 4:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We're performing some changes to optimize the outlook.com iOS sign-in experience and, once complete, we'll provide instructions to help users sign back into their accounts. In the interim as we develop this change, we recommend trying the following steps to sign in to your account: 1. Open the Settings app on your iPhone. 2. Scroll down and tap on Mail. 3. Select Accounts under the Mail settings. 4. Tap on the email account for which you need to reenter the password. 5. Tap on Account Settings or directly on the Password field (depending on your iOS version). 6. Enter the updated or correct password in the Password field. 7. Tap Done to save the changes. 8. Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Next update by: Tuesday, April 28, 2026, at 11:00 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We're continuing to optimize the outlook.com iOS sign-in experience to address reports of persisting impact. We've also investigated the scenario in which users are encountering repeated sign-in prompts and are then informed, "You've tried to sign in too many times with an incorrect account or password"; users experiencing this scenario should sign in with other methods or reset their password to sign in to their accounts. We'll provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 1:30 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We're continuing to optimize the outlook.com iOS sign-in experience to address reports of persisting impact. We've also investigated the scenario in which users are encountering repeated sign-in prompts and are then informed, "You've tried to sign in too many times with an incorrect account or password"; users experiencing this scenario should sign in with other methods or reset their password to sign in to their accounts. We'll provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 1:30 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We’re continuing to implement further optimizations for the outlook.com iOS sign-in experience to help address reports of persisting impact. While we monitor these optimization changes to assess their effectiveness, we’re also looking into what additional changes may be needed to address the scenario in which users are encountering repeated sign-in prompts. We still recommend that for users experiencing this scenario, they should sign in with other methods or reset their password to sign in to their accounts. We’ll continue to provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 3:30 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More Info: If you are still impacted, we recommend the following steps outlined below to sign-in again on iOS devices: 1. Open the Settings app on your iPhone. 2. Scroll down and tap on Mail. 3. Select Accounts under the Mail settings. 4. Tap on the email account for which you need to reenter the password. 5. Tap on Account Settings or directly on the Password field. This will depend on your iOS version. 6. Enter the updated or correct password in the Password field. 7. Tap Done to save the changes. 8. Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: We’ve completed all our optimization changes to fully address the impact for the outlook.com iOS sign-in experience and we’ve confirmed service health has returned to normal. We anticipate that users should no longer experience repeated sign-in prompts hindering the sign-in process. We recommend that users attempt to sign-in again and if they encounter the error message stating “You’ve tried to sign-in too many times with an incorrect account or password”, they should follow the inline user experience to reset their password and sign-in again. Next update by: Wednesday, April 29, 2026, at 9:00 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More Info: If you are still impacted, we recommend the following steps outlined below to sign-in again on iOS devices: 1. Open the Settings app on your iPhone. 2. Scroll down and tap on Mail. 3. Select Accounts under the Mail settings. 4. Tap on the email account for which you need to reenter the password. 5. Tap on Account Settings or directly on the Password field. This will depend on your iOS version. 6. Enter the updated or correct password in the Password field. 7. Tap Done to save the changes. 8. Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: We’re closely monitoring our internal and external service telemetry to ensure the impact does not reoccur. We still advise that users attempt to sign-in again and if they encounter the error message stating “You’ve tried to sign-in too many times with an incorrect account or password”, they should follow the inline user experience to reset their password and sign-in again. Next update by: Wednesday, April 29, 2026, at 2:00 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We’re continuing to closely monitor service telemetry which continues to show the mitigation actions have been successful. However, if users are still impacted, we recommend that users attempt to sign-in again and if they encounter the error message stating “You’ve tried to sign-in too many times with an incorrect account or password”, they should follow the inline user experience to reset their password and sign-in again. Next update by: Wednesday, April 29, 2026, at 10:00 PM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. Current status: We’ve received reports that impact associated with OL1292958 persists. We've resumed our investigation of the issue and are currently analyzing service telemetry and investigating reported behavior to determine scope and next steps. Next update by: Tuesday, April 28, 2026, at 5:00 PM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. Current status: We're performing some changes to optimize the outlook.com iOS sign-in experience and, once complete, we'll provide instructions to help users sign back into their accounts. In the interim as we develop this change, we recommend trying the following steps to sign in to your account: 1. Open the Settings app on your iPhone. 2. Scroll down and tap on Mail. 3. Select Accounts under the Mail settings. 4. Tap on the email account for which you need to reenter the password. 5. Tap on Account Settings or directly on the Password field (depending on your iOS version). 6. Enter the updated or correct password in the Password field. 7. Tap Done to save the changes. 8. Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Next update by: Tuesday, April 28, 2026, at 11:00 PM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. Current status: We're continuing to optimize the outlook.com iOS sign-in experience to address reports of persisting impact. We've also investigated the scenario in which users are encountering repeated sign-in prompts and are then informed, "You've tried to sign in too many times with an incorrect account or password"; users experiencing this scenario should sign in with other methods or reset their password to sign in to their accounts. We'll provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 1:30 AM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. Current status: We're continuing to optimize the outlook.com iOS sign-in experience to address reports of persisting impact. We've also investigated the scenario in which users are encountering repeated sign-in prompts and are then informed, "You've tried to sign in too many times with an incorrect account or password"; users experiencing this scenario should sign in with other methods or reset their password to sign in to their accounts. We'll provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 1:30 AM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. Current status: We’re continuing to implement further optimizations for the outlook.com iOS sign-in experience to help address reports of persisting impact. While we monitor these optimization changes to assess their effectiveness, we’re also looking into what additional changes may be needed to address the scenario in which users are encountering repeated sign-in prompts. We still recommend that for users experiencing this scenario, they should sign in with other methods or reset their password to sign in to their accounts. We’ll continue to provide more guidance as it becomes available. Next update by: Wednesday, April 29, 2026, at 3:30 AM UTC

User impact: Users may experience intermittent issues signing-in to Outlook.com in the iOS mail app. More Info: If you are still impacted, we recommend the following steps outlined below to sign-in again on iOS devices: 1. Open the Settings app on your iPhone. 2. Scroll down and tap on Mail. 3. Select Accounts under the Mail settings. 4. Tap on the email account for which you need to reenter the password. 5. Tap on Account Settings or directly on the Password field. This will depend on your iOS version. 6. Enter the updated or correct password in the Password field. 7. Tap Done to save the changes. 8. Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: We’ve completed all our optimization changes to fully address the impact for the outlook.com iOS sign-in experience and we’ve confirmed service health has returned to normal. We anticipate that users should no longer experience repeated sign-in prompts hindering the sign-in process. We recommend that users attempt to sign-in again and if they encounter the error message stating “You’ve tried to sign-in too many times with an incorrect account or password”, they should follow the inline user experience to reset their password and sign-in again. Next update by: Wednesday, April 29, 2026, at 9:00 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. Current status: We’re analysing service telemetry and investigating reported behaviour to determine scope and next steps. Next update by: Monday, April 27, 2026, at 11:30 AM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Some users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Current status: Our investigation indicates client sign-in scenarios may be contributing to the reported behaviour, and we're focused on validating interactions across service components to identify next steps. Next update by: Monday, April 27, 2026, at 12:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Current status: We’re reviewing a recent change as part of our ongoing investigation and determining next steps. Next update by: Monday, April 27, 2026, at 1:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs.  Current status: We're reverting a recently introduced change to determine if this action provides relief from impact upon completion. In parallel, we're continuing to analyze customer reports, and we're closely monitoring service telemetry to identify our next steps and potential mitigation actions. Next update by: Monday, April 27, 2026, at 2:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: We've completed reverting the recently introduced change, however, this has not produced any relief. We're continuing to investigate the unexpected increase in error rates affecting two separate error scenarios to identify any potential root cause which may be responsible for this. Additionally, we're closely monitoring service telemetry to discover any other potential actions, or mitigation steps. Next update by: Monday, April 27, 2026, at 3:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: We’re seeing specific errors related to authentication key failures. We’re working to determine the underlying cause in order to determine our next mitigation steps. Next update by: Monday, April 27, 2026, at 4:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: We're running tests to reproduce impact in our internal environment to obtain additional logging to isolate the source of the unexpected error messages. Next update by: Monday, April 27, 2026, at 5:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: We've identified a recent service change that is potentially contributing to user impact. We're testing a roll back of this change to determine if this remediates impact. In parallel, we're continuing to investigate the unusual error patterns that were previously observed. Next update by: Monday, April 27, 2026, at 6:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: The roll back that was completed does not appear to have provided the intended impact relief. We're continuing to look at internal reproductions of the impact to find potential next steps for mitigation and understand the source of error messages.  Next update by: Monday, April 27, 2026, at 7:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Additionally, impacted users may include, but are not limited to, iOS users. Current status: After reviewing the logs collected from internal reproductions we've found a pattern of errors that point to a recent backend configuration change that may be causing impact. We've completed a roll back of this configuration change. We're now carefully monitoring the environment to determine if it worked as intended or if there are additional steps required for full incident resolution. Next update by: Monday, April 27, 2026, at 8:30 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: Users may experience intermittent sign‑in failures, including “too many requests” errors or unexpected sign‑outs. Impacted users may include, but are not limited to, iOS users. iOS users on iPhones must take the following steps to re-enter their password and access their accounts: -Open the Settings app on your iPhone. -Scroll down and tap on Mail. -Select Accounts under the Mail settings. -Tap on the email account for which you need to reenter the password. -Tap on Account Settings or directly on the Password field (depending on your iOS version). -Enter the updated or correct password in the Password field. -Tap Done to save the changes. -Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: The roll back of the previously mentioned configuration change is complete and our telemetry indicates service health is recovering. We'll continue to monitor to confirm this fully resolves the issue. iOS users must take additional steps to re-enter their password to successfully access Outlook accounts. Please see the steps in the "more info" section above. Next update by: Monday, April 27, 2026, at 9:00 PM UTC

User impact: Users may experience intermittent issues signing in to Outlook.com. More info: iOS users on iPhones MUST take the following steps to re-enter their password and access their accounts: -Open the Settings app on your iPhone. -Scroll down and tap on Mail. -Select Accounts under the Mail settings. -Tap on the email account for which you need to reenter the password. -Tap on Account Settings or directly on the Password field (depending on your iOS version). -Enter the updated or correct password in the Password field. -Tap Done to save the changes. -Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: System telemetry indicates that the service remains healthy. iOS users MUST take additional steps to re-enter their password to successfully access Outlook accounts. Please see the steps in the "more info" section above. Start time: Monday, April 27, 2026, at 8:45 AM UTC End time: Monday, April 27, 2026, at 7:16 PM UTC Next update by: Monday, April 27, 2026, at 10:00 PM UTC

User impact: We're checking for potential impact. Current status: We're investigating a potential issue affecting access to Outlook.com, and we'll provide an update within 30 minutes.

User impact: iOS users may experience issues accessing Outlook.com. More info: iOS users on iPhones MUST take the following steps to re-enter their password and access their accounts: -Open the Settings app on your iPhone. -Scroll down and tap on Mail. -Select Accounts under the Mail settings. -Tap on the email account for which you need to reenter the password. -Tap on Account Settings or directly on the Password field (depending on your iOS version). -Enter the updated or correct password in the Password field. -Tap Done to save the changes. -Open the Mail app to confirm that the account is syncing properly and emails are being sent/received. Current status: While the service remains healthy, we're keeping this notification so users can take the actions outlined in this communication: iOS users MUST take additional steps to re-enter their password to successfully access Outlook accounts. Please see the steps in the "more info" section above. Start time: Monday, April 27, 2026, at 8:45 AM UTC End time: Monday, April 27, 2026, at 7:16 PM UTC Next update by: Monday, April 27, 2026, at 10:00 PM UTC