Users may be unable to add their personal Google or Gmail calendars in Outlook on the web

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may have been unable to add their personal Google or Gmail calendars in Outlook on the web. More info: Affected users reported that they received a blank page when attempting to add their personal Google or Gmail calendars in Outlook on the web when navigating to Settings -> Calendar -> Accounts -> Google -> Add personal calendar. Final status: We've completed deployment of our fix to address a URL mismatch and validated both internally and with a subset of affected users that our actions successfully remediated impact. Scope of impact: Users attempting to add their personal Google or Gmail calendars in Outlook on the web may have been impacted. Start time: Tuesday, February 24, 2026, at 10:16 AM UTC End time: Friday, August 7, 2026, at 11:20 AM UTC Root cause: The URLs being utilized to issue the necessary authentication component to add Google or Gmail calendars in Outlook on the web didn't match, resulting in authentication failing. Next steps: - We're validating how the URL mismatch was first introduced into our service to further our understanding of the impact scenario and to confirm what actions we can take to ensure similar impact scenarios don't occur in the future. This is the final update for the event.

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web. More info: Affected users may report that they receive a blank page when attempting to add their personal Google or Gmail calendars in Outlook on the web when navigating to Settings -> Calendar -> Accounts -> Google -> Add personal calendar. Current status: We can confirm that our fix has been deployed and has saturated 30 percent of the affected environment. We'll continue to monitor as the fix progresses to ensure the impact is fully remediated. Scope of impact: Users attempting to add their personal Google or Gmail calendars in Outlook on the web may be impacted. This section may be updated as our investigation progresses. Start time: Tuesday, February 24, 2026, at 10:16 AM UTC Root cause: The URLs being utilized to issue the necessary authentication component to add Google or Gmail calendars in Outlook on the web don't match, resulting in authentication failing. Next update by: Thursday, August 13, 2026, at 10:00 PM UTC

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web. More info: Affected users may report that they receive a blank page when attempting to add their personal Google or Gmail calendars in Outlook on the web when navigating to Settings -> Calendar -> Accounts -> Google -> Add personal calendar. Current status: After analyzing provided HAR files and screenshots of impact, we've isolated that the URLs being utilized to issue the necessary authentication component to add Google or Gmail calendars in Outlook on the web don't match, resulting in authentication failing. We're developing a fix to remediate the mismatch and we aim to provide a timeline to remediation in our next scheduled update. Scope of impact: Users attempting to add their personal Google or Gmail calendars in Outlook on the web may be impacted. This section may be updated as our investigation progresses. Start time: Tuesday, February 24, 2026, at 10:16 AM UTC Root cause: The URLs being utilized to issue the necessary authentication component to add Google or Gmail calendars in Outlook on the web don't match, resulting in authentication failing. Next update by: Thursday, August 13, 2026, at 10:00 PM UTC

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web. More info: Affected users may report that they receive a blank page when attempting to add their personal Google or Gmail calendars in Outlook on the web when navigating to Settings -> Calendar -> Accounts -> Google -> Add personal calendar. Current status: We're continuing our analysis of HAR logs and screenshots of impact from affected users to further investigate this issue and determine our next troubleshooting steps. Scope of impact: Users attempting to add their personal Google or Gmail calendars in Outlook on the web may be impacted. This section may be updated as our investigation progresses. Next update by: Wednesday, July 29, 2026, at 9:30 PM UTC

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web. More info: Affected users may report that they receive a blank page when attempting to add their personal Google or Gmail calendars in Outlook on the web when navigating to Settings -> Calendar -> Accounts -> Google -> Add personal calendar. Current status: We're reviewing support provided data from affected users, including HTTP Archive format (HAR) logs and screenshots of impact, to investigate into this issue's root cause. Scope of impact: Users attempting to add their personal Google or Gmail calendars in Outlook on the web may be impacted. This section may be updated as our investigation progresses. Next update by: Wednesday, July 29, 2026, at 6:00 PM UTC

Title: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web User impact: Users may be unable to add their personal Google or Gmail calendars in Outlook on the web. Current status: We're investigating a potential issue impacting Exchange Online in which users can't add personal Google or Gmail Calendars in Outlook on the web. We're checking for impact to your organization and will provide an update in approximately 30 minutes.