Status Page

O365 - Email/Outlook

2026-10-02	Status	Description
03:53 PM		Active: - Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. - Users may be unable to update calendar delegates in the classic Outlook desktop client. - Users may see unwanted add-ins appearing automatically across all Outlook clients.
03:52 PM		Resolved: - Users’ email messages may not have been quarantined and failed to be stored in the quarantine folder.
08:12 AM		Active: - Users’ email messages may not be quarantined and might fail to be stored in the quarantine folder. - Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. - Users may be unable to update calendar delegates in the classic Outlook desktop client. - Users may see unwanted add-ins appearing automatically across all Outlook clients.
08:11 AM		Resolved: - Users may have been unable to search for email in Outlook desktop and Outlook on the web.

2026-10-01	Status	Description
08:16 AM		Active: - Users’ email messages may not be quarantined and might fail to be stored in the quarantine folder. - Users may be unable to search for email in Outlook desktop and Outlook on the web. - Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. - Users may be unable to update calendar delegates in the classic Outlook desktop client. - Users may see unwanted add-ins appearing automatically across all Outlook clients.

2026-09-29	Status	Description
07:23 AM		Active: - Users may be unable to search for email in Outlook desktop and Outlook on the web. - Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. - Users may be unable to update calendar delegates in the classic Outlook desktop client. - Users may see unwanted add-ins appearing automatically across all Outlook clients.

2026-09-28	Status	Description
07:12 AM		Active: - Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. - Users may be unable to update calendar delegates in the classic Outlook desktop client - Users may see unwanted add-ins appearing automatically across all Outlook clients.

2026-09-24	Status	Description
11:59 AM		Users may be unable to update calendar delegates in the classic Outlook desktop client Current status: We've identified that a recently enabled change may be causing authentication failures affecting delegate permission modification requests. We're reverting the change and are validating service telemetry to confirm recovery for affected users.

2026-09-23	Status	Description
02:16 PM		Active: - Users may see unwanted add-ins appearing automatically across all Outlook clients.
02:15 PM		Resolved: - Users may have been unable to open the account view in Outlook on the web.
08:04 AM		Active Issues: - Users may be unable to open the account view in Outlook on the web. - Users may see unwanted add-ins appearing automatically across all Outlook clients.