IOS Outlook app keeps crashing when I open it

Question

IOS Outlook app keeps crashing when I open it

Oeftering, Matthew P 15

Issue just started this evening. When I open the IOS Outlook app, it will crash and close after a few seconds.

Rawlinson, Chase 0 Reputation points

2026-09-23T21:14:20.0866667+00:00

@Jade Ng how are we supposed to report the issue through the Outlook for iOS if the app crashes immediately upon opening and we cannot access support?
Rawlinson, Chase 0 Reputation points

2026-09-23T21:16:37.42+00:00

I am running iOS27 on an Apple 16 Pro Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots.
Russell Hockman 0 Reputation points

2026-09-23T23:02:34.6566667+00:00

Same issue here. I am running iOS27 on an Apple 15 Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots. Even setup user on a new phone and Outlook continues to crash for the user. Seems to be an issue with 5.2637.0. My personal phone has outlook app version 5.26.35.1 and its running fine with no issues.
Russell Hockman 0 Reputation points

2026-09-23T23:13:44.7766667+00:00

Same issue here. I am running iOS27 on an Apple 15 Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots. Even setup user on a new phone and Outlook continues to crash for the user. Seems to be an issue with 5.2637.0. My personal phone has outlook app version 5.26.35.1 and its running fine with no issues.

Also getting the message: Your admin has enabled contact save in Outlook's settings. Please grant permissions so that Outlook can export contacts from your email account to the Contacts app.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-24T06:17:12.7033333+00:00

Dear Everyone,

If Outlook for iOS continues to crash after updating iOS and Outlook, restarting the device, and reinstalling the app, you can report the issue through the Ideas · Community

Please notice and accept my apologies that as moderators in the community, we are not supported for the product design and have limited resources for the advanced info for Microsoft products. To help you send your feedback and requirement to the related development team, we have redirected you to the correct path.

Thank you for your kindness and understanding.
carrehec 0 Reputation points

2026-09-24T15:08:48.64+00:00

@Jade Ng this is still unresolved. Please provide an expeditious update. I am using enterprise apps and rely on Exchange for business-critical applications and Outlook for iOS continues to crash.

Both iOS and the app have been updated to the latest versions.

I can provide iPhone crash logs if needed.
Shawn Ambrus 0 Reputation points

2026-09-24T19:55:18.4333333+00:00

My IT department is clueless on how to help me fix this issue. I cannot do anything with my phone for work. I have a. iPhone 15 running 26.7 and Outlook version 5.2637
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-25T05:59:21.4833333+00:00

Dear Everyone,

For the time being, please use Outlook on the web as a temporary workaround to access your email and calendar where possible.

I will continue to follow the status of this issue and will update this thread when a confirmed fix or further information becomes available.
Hornblower409 15,815 Reputation points

2026-09-26T02:54:09.2433333+00:00

@Jade Ng

Just FYI - I'm seeing a report on Reddit that this was fixed with version 5.2637.1 from the App store. I can't confirm.

[External Non-Microsoft Site] https://www.reddit.com/r/Outlook/comments/1wnl29o/iphone_app_crashes_on_launch_help/

u/pegboy4691 - a new version of the Outlook app for iOS is now avaiable in the app store. 5.2637.1. We just tested with 3 users and all 3 users are no longer crashing
Adam Lindsay-Finan 0 Reputation points

2026-09-26T09:54:27.6866667+00:00

Latest version installed, still does it. Weirdly it only one 365 account causing it, if I don't add that account its fine.
Hornblower409 15,815 Reputation points

2026-09-27T04:42:40.7333333+00:00

@Adam Lindsay-Finan said

Latest version installed, still does it. Weirdly it only one 365 account causing it

You obviously are not seeing the same problem as most others. You need to start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-28T07:02:37.3366667+00:00

Dear Everyone,

For anyone still experiencing this issue, please refer to the latest update from the original poster. They confirmed that they updated the Outlook app and are no longer experiencing the crashing issue.

Please ensure that your Outlook for iOS app is fully updated and then test again to see whether the issue is resolved on your device.

1 answer

Your answer

Rawlinson, Chase 0 Reputation points

2026-09-23T21:14:20.0866667+00:00

@Jade Ng how are we supposed to report the issue through the Outlook for iOS if the app crashes immediately upon opening and we cannot access support?
Rawlinson, Chase 0 Reputation points

2026-09-23T21:16:37.42+00:00

I am running iOS27 on an Apple 16 Pro Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots.
Russell Hockman 0 Reputation points

2026-09-23T23:02:34.6566667+00:00

Same issue here. I am running iOS27 on an Apple 15 Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots. Even setup user on a new phone and Outlook continues to crash for the user. Seems to be an issue with 5.2637.0. My personal phone has outlook app version 5.26.35.1 and its running fine with no issues.
Russell Hockman 0 Reputation points

2026-09-23T23:13:44.7766667+00:00

Same issue here. I am running iOS27 on an Apple 15 Max and Outlook app version 5.2637.0 and the app crashes immediately unless opened in Airplane mode. All iOS and app versions are latest revision. App continues to crash after multiple device reboots. Even setup user on a new phone and Outlook continues to crash for the user. Seems to be an issue with 5.2637.0. My personal phone has outlook app version 5.26.35.1 and its running fine with no issues.

Also getting the message: Your admin has enabled contact save in Outlook's settings. Please grant permissions so that Outlook can export contacts from your email account to the Contacts app.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-24T06:17:12.7033333+00:00

Dear Everyone,

If Outlook for iOS continues to crash after updating iOS and Outlook, restarting the device, and reinstalling the app, you can report the issue through the Ideas · Community

Please notice and accept my apologies that as moderators in the community, we are not supported for the product design and have limited resources for the advanced info for Microsoft products. To help you send your feedback and requirement to the related development team, we have redirected you to the correct path.

Thank you for your kindness and understanding.
carrehec 0 Reputation points

2026-09-24T15:08:48.64+00:00

@Jade Ng this is still unresolved. Please provide an expeditious update. I am using enterprise apps and rely on Exchange for business-critical applications and Outlook for iOS continues to crash.

Both iOS and the app have been updated to the latest versions.

I can provide iPhone crash logs if needed.
Shawn Ambrus 0 Reputation points

2026-09-24T19:55:18.4333333+00:00

My IT department is clueless on how to help me fix this issue. I cannot do anything with my phone for work. I have a. iPhone 15 running 26.7 and Outlook version 5.2637
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-25T05:59:21.4833333+00:00

Dear Everyone,

For the time being, please use Outlook on the web as a temporary workaround to access your email and calendar where possible.

I will continue to follow the status of this issue and will update this thread when a confirmed fix or further information becomes available.
Hornblower409 15,815 Reputation points

2026-09-26T02:54:09.2433333+00:00

@Jade Ng

Just FYI - I'm seeing a report on Reddit that this was fixed with version 5.2637.1 from the App store. I can't confirm.

[External Non-Microsoft Site] https://www.reddit.com/r/Outlook/comments/1wnl29o/iphone_app_crashes_on_launch_help/

u/pegboy4691 - a new version of the Outlook app for iOS is now avaiable in the app store. 5.2637.1. We just tested with 3 users and all 3 users are no longer crashing
Adam Lindsay-Finan 0 Reputation points

2026-09-26T09:54:27.6866667+00:00

Latest version installed, still does it. Weirdly it only one 365 account causing it, if I don't add that account its fine.
Hornblower409 15,815 Reputation points

2026-09-27T04:42:40.7333333+00:00

@Adam Lindsay-Finan said

Latest version installed, still does it. Weirdly it only one 365 account causing it

You obviously are not seeing the same problem as most others. You need to start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-28T07:02:37.3366667+00:00

Dear Everyone,

For anyone still experiencing this issue, please refer to the latest update from the original poster. They confirmed that they updated the Outlook app and are no longer experiencing the crashing issue.

Please ensure that your Outlook for iOS app is fully updated and then test again to see whether the issue is resolved on your device.

Answer 1

Jade Ng 15,760 Microsoft External Staff Moderator

Dear Oeftering, Matthew P,

Based on the symptoms you described, this may be related to a currently known issue affecting Outlook for iOS version 5.2635.1 on older versions of iOS. Microsoft Engineering is currently investigating this behavior, where Outlook may become unresponsive during startup or crash when launched.

For reference, please see: Outlook for iOS may become unresponsive or crash on launch

While the issue is being investigated, Microsoft recommends the following workaround:

Check whether an iOS update is available for your device.
Update your device to the latest available version of iOS.
After the update is complete, launch Outlook again and check whether the issue persists.

User's image

Thanks for your patience and understanding so far.  Hope you having a nice day and really much warm regards to you as well!

Oeftering, Matthew P 15 Reputation points

2026-09-23T03:22:43.0066667+00:00

I’m currently running iOS 27 and the symptoms are still there.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-23T04:21:31.4266667+00:00
Dear Oeftering, Matthew P,

Thank you for your update!

Since the issue persists even after updating iOS, please try the following steps:

Restart your iPhone/iPad completely, then open Outlook again and check whether the issue persists.

If Outlook continues to crash, uninstall Outlook app and reinstall it from the App Store.

After reinstalling, sign back in and check whether Outlook remains open normally.

If the issue still occurs after these steps, it may be related to the Outlook for iOS issue that Microsoft is currently investigating. In that case, please continue using an alternative method to access your mailbox where possible (e.g. Outlook web) while Microsoft works on the issue.

I would also recommend reporting the issue through Outlook for iOS so that the Outlook team can receive additional diagnostic information from affected users.

Thank you for your kindness and understanding.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-24T06:17:50.0866667+00:00

Dear Oeftering, Matthew P,

I hope you are doing well!

Could you kindly confirm if there have been any recent updates on your side?

Thank you for your cooperation. Looking forward to hearing from you!
Oeftering, Matthew P 15 Reputation points

2026-09-24T16:19:28.3266667+00:00

Still unresolved. 5.2637.0 and iOS27

I travel for work. This is becoming unacceptable that I can’t access Outlook to manage emails and my calendar without painful workarounds.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-25T05:22:38.9+00:00

Dear Oeftering, Matthew P,

I’m sorry the issue is still occurring, and I understand how frustrating this must be, especially when you rely on Outlook while travelling for work.

The issue is currently being investigated by the Microsoft product team. In the meantime, please use Outlook on the web as a temporary workaround to access your email and calendar.

I will continue to monitor the issue, and once a fix is confirmed, I will update you here as soon as possible.

Thank you for your continued patience and understanding. I sincerely apologize for the inconvenience this has caused.
Oeftering, Matthew P 15 Reputation points

2026-09-27T16:06:22.0766667+00:00

I’ve updated the app and no longer having the issues.
Jade Ng 15,760 Reputation points Microsoft External Staff Moderator

2026-09-28T06:59:45.37+00:00

Dear Oeftering, Matthew P,

That’s great news! I’m glad to hear that after updating the Outlook app, the crashing issue has been resolved and everything is working normally again.

If you encounter any other issues, please feel free to post a new question so other moderators can help, or tag me so I can continue supporting you in the future.

Thank you very much for your valuable time and your cooperation.