Status Page

O365 - Email/Outlook

2025-12-08	Status	Description
10:36 AM		EXCHANGE NOTICE Some users may be unable to open inbound Secure/Multipurpose Internet Mail Extensions (S/MIME) encrypted email messages Service Degradation More info: This issue strictly impacts users with the Dynamic Delivery policy enabled. The service provider has temporarily disabled Dynamic Delivery while they work to resolve this issue. This action may result in potential delays of up to fifteen minutes for users to receive email messages with attachments. The length of the delay will depend on the attachments associated with the email message. Additionally, some users see a "Safe Attachments Scan in Progress" message upon opening an encrypted inbound email message. Current status: While the service provider reviews HTTP Archive format (HAR) network trace logs to isolate the underlying cause of impact, they've disabled Dynamic Delivery to avoid new email messages from becoming impacted. In parallel, they're in the process of validating a fix to allow delivered S/MIME encrypted email messages to be viewed as expected. Start time: Saturday, November 29, 2025, at 9:00 PM AST
10:27 AM		EXCHANGE NOTICE Users may be unable to open Excel files attached to email messages in new Outlook and receive an error Service Restored More info: Users received an error stating: "Try opening the file again later." This issue impacted attachments that contained non-ASCII characters. As a way to avoid impact, users with access to Outlook on the web could have used this to bypass the impact or downloaded the file locally to manually open Excel files. Final status: The service provider has confirmed that their deployment finished saturating and is now available in the newest version upgrade, 20251128003.06. They've also verified through final customer testing that impact is fully remediated once users upgrade their Outlook clients to version 20251128003.06. Start time: Friday, November 14, 2025, at 5:00 PM AST End time: Friday, December 5, 2025, at 3:00 PM AST