Title: Some users' Exchange Online email messages may not be retrieved when prompting Microsoft 365 Copilot Chat User impact: Users' Exchange Online email messages may not be retrieved when prompting Copilot Chat. More info: Some Exchange Online email messages between July 22, 2026, and today may not be retrieved by Copilot Chat when prompted. While we index the affected email messages to our semantic index model, users can prompt Copilot Chat using exact wording to retrieve the email messages. Current status: The initial 10% of the deployment has saturated throughout the affected infrastructure and has proven successful. We’re now in the process of deploying another 40% of the fix while we continue monitoring service health. Additionally, we expect that some users may be incrementally remediated as the deployment continues to saturate throughout the affected environment. Scope of impact: Some users that are attempting to prompt Copilot Chat to retrieve details from Exchange Online email messages between July 22, 2026, and today may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, July 22, 2026, at 10:07 PM UTC Root cause: A service change introduced a misconfiguration that prevented Exchange Online email messages between July 22, 2026, and today from being indexed by our semantic index model, causing impact. Next update by: Sunday, September 20, 2026, at 3:00 AM UTC
Title: Some users' Exchange Online email messages may not be retrieved when prompting Microsoft 365 Copilot Chat User impact: Users' Exchange Online email messages may not be retrieved when prompting Copilot Chat. More info: Some Exchange Online email messages between July 22, 2026, and today may not be retrieved by Copilot Chat when prompted. While we index the affected email messages to our semantic index model, users can prompt Copilot Chat using exact wording to retrieve the email messages. Current status: The initial 10% of the deployment has saturated throughout the affected infrastructure and has proven successful. We’re now in the process of deploying another 40% of the fix while we continue monitoring service health. Additionally, we expect that some users may be incrementally remediated as the deployment continues to saturate throughout the affected environment. Scope of impact: Some users that are attempting to prompt Copilot Chat to retrieve details from Exchange Online email messages between July 22, 2026, and today may be impacted. This information may be updated as our investigation continues. Start time: Wednesday, July 22, 2026, at 10:07 PM UTC Root cause: A service change introduced a misconfiguration that prevented Exchange Online email messages between July 22, 2026, and today from being indexed by our semantic index model, causing impact. Next update by: Sunday, September 20, 2026, at 3:00 AM UTC
A Windows update released September 8 has left Claude Cowork on Windows unable to run local commands, because its workspace can no longer reach your computer's drive. For most users, chat and file reading and editing still work. There's no in-app workaround yet, and restarting or reinstalling won't help. Microsoft has developed a fix and is working to release it. We'll post an update when we have more to share.
We are continuing to work on a fix for this issue.
