Status Page

O365 - Email/Outlook

2024-07-19	Status	Description
03:36 PM		User impact: Users' email that was signed but not encrypted may have been unable to be opened in Outlook desktop client. Final status: We've confirmed that the new version containing the fix has been released for the iOS Outlook mobile app, version 4.2427.1 We recommend users manually update their iOS Outlook mobile app to version 4.2427.1, and their Android Outlook mobile app to version 4.2427.2 to remediate impact.
09:29 AM		User impact: Users' email that's signed but not encrypted may be unable to be opened in Outlook desktop client. More info: This impacts messages that are signed but not encrypted using Secure/Multipurpose Internet Mail Extensions (S/MIME) for version 4.2427.0 of the iOS Outlook mobile app and version 4.2427.1 of the Android Outlook mobile app. Users receive an error when opening the affected signed email messages in Outlook on the web, but the content of the message is still available. The error states "S/MIME isn't supported in this view".

2024-07-18	Status	Description
02:01 PM		User impact: User's email sent using a specific encryption type may be unable to be opened in Outlook on the web and desktop clients. More info: This impacts messages encrypted using Secure/Multipurpose Internet Mail Extensions (S/MIME) for version 4.2427.0 of the iOS Outlook mobile app and version 4.2427.1 of the Android Outlook mobile app. Current status: We've identified a code issue in version 4.2427.0 of the iOS Outlook mobile app and version 4.2427.1 of the Android Outlook mobile app that's preventing messages sent with S/MIME encryption from being opened in Outlook on the web and the Outlook desktop client. We've developed new versions of these Outlook mobile apps with corrected coding that we expect will remediate impact. We're working to introduce these fixed builds to their associated app stores, allowing users to install them and remediate impact. To prevent this issue from occurring we recommend against installing version 4.2427.0 of the iOS Outlook mobile app, or version 4.2427.1 of the Android Outlook mobile app. Scope of impact: Any user with version 4.2427.0 of the iOS Outlook mobile app or version 4.2427.1 of the Android Outlook mobile app that attempts to send a S/MIME Encrypted email message may be impacted. Start time: Monday, July 15, 2024, at 7:04 PM UTC Root cause: A code issue in version 4.2427.0 of the iOS Outlook mobile app and version 4.2427.1 of the Android Outlook mobile app that's preventing messages sent with S/MIME encryption from being opened in Outlook on the web and the Outlook desktop client.

2024-07-16	Status	Description
03:20 PM		User impact: Users may be unable to access shared calendars in the Outlook desktop app. More info: Users with access to Outlook on the web or Outlook for Windows can use alternate Outlook clients to access their shared calendars without issue while we focus on fixing the problem.
08:56 AM		User impact: Users may be unable to access shared calendars in the Outlook desktop app. More info: Users that have access to Outlook on the web can use this connection method to access their shared calendars without issue while we focus on remediating the problem. Current status: Our investigation so far has determined that an unusually large volume of hyperlinks are cached in the Outlook desktop app navigation panel data cache, preventing the data pathway used by shared calendars from functioning as expected and leading to impact. While we continue our investigation to isolate the root cause of the hyperlink proliferation, we recommend following the link in the More Info section above to bypass this issue.