Status Page

O365 - Email/Outlook

2026-06-17	Status	Description
03:37 PM		Active Issues: - Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable. - Users may be unable to see the free/busy status of multiple cross-tenant mailboxes in Exchange Online.
07:58 AM		Users may be unable to see the free/busy status of multiple cross-tenant mailboxes in Exchange Online User impact: Users may be unable to see the free/busy status of multiple cross-tenant mailboxes in Exchange Online. More info: This impact occurs only when two or more mailbox statuses are requested. Current status: We've validated that the source of impact was a NetCore deployment, which introduced a regression where headers were being dropped during free/busy status requests for cross-tenant scenarios, resulting in back-end authentication requests failing. Our fix to address the regression is currently at 90 percent saturation in the affected environment, and we've reached out to affected users to begin testing for remediation.

2026-06-15	Status	Description
08:01 AM		Active Issue: - Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable. Resolved Issue: - Users may have been unable to create new online meetings from shared calendar events in Exchange Online.

2026-06-08	Status	Description
07:34 AM		Active Issues: - Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable. - Users may be unable to create new online meetings from shared calendar events in Exchange Online. Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected. Resolved Issue: - When a user opened and edited an email message in the draft folder, sent it, and then viewed it from their sent folder, the edited portion may have appeared blank in the message preview.

2026-06-02	Status	Description
07:18 AM		Active Issues: - When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion may appear blank in the message preview. Impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" message organization setting to avoid this issue. - Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable. - Users may be unable to create new online meetings from shared calendar events in Exchange Online. Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected. Resolved Issue: - Users may have experienced errors or failures when accessing their mailbox via one or more Exchange Online connection methods, including Outlook on the web.

2026-06-01	Status	Description
11:59 AM		Active Issues: - Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods, including Outlook on the web. - When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion may appear blank in the message preview. Impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" message organization setting to avoid this issue. - Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable. - Users may be unable to create new online meetings from shared calendar events in Exchange Online. Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.