Microsoft has officially confirmed that a recent update to Outlook Classic inadvertently disabled Copilot integration for some users. If you’ve noticed the Copilot button vanishing from your Ribbon menu or the feature refusing to launch, you aren’t alone. The company addressed the problem in a support document, noting that the issue affects users who have updated to build 20026.20182 or higher. This Copilot Outlook Classic bug has left many users without access to AI-powered features they rely on for drafting and managing emails.
This bug specifically impacts those with a Copilot Chat (Basic) license or a paid M365 Copilot (Premium) account. While the integration is broken in the classic desktop app, users can still access Copilot through Outlook on the web or the New Outlook app without interruption. Microsoft has not yet specified which channel delivered the problematic update, but the fix is expected to roll out soon.
The Copilot Outlook Classic Bug Confirmed
According to Microsoft, the root cause lies in how Outlook Classic handles user profile settings. The application is struggling to load Copilot-related configurations because it cannot locate a specific MAPI property known as PR_PROFILE_USER_SMTP_EMAIL_ADDRESS_W. This error occurs within the profile section, effectively preventing the AI features from initializing even though the underlying components remain installed. In practical terms, this means Copilot is present but unable to function.
Users might see the Copilot icon grayed out in the Ribbon, find that it fails to open when added as an app, or notice it completely missing from the interface after the update. The issue is tied to the profile’s ability to recognize the user’s email address, which is crucial for authenticating Copilot requests and linking the session to your license.
Workarounds and Fixes
While Microsoft works on a permanent solution, the company has outlined several steps to restore functionality. First, try restarting Windows and rebooting Outlook to see if a simple refresh resolves the loading error. If the issue persists, creating a new Outlook profile is the most reliable workaround, as it forces the application to rebuild the necessary profile data. This process involves accessing the Mail settings in the Windows Control Panel and selecting Show Profiles to add a new one.
Additional measures include purging the Outlook cache and deleting local configuration files. These steps help clear any corrupted data that might be triggering the MAPI property error. Microsoft advises that if these workarounds do not help, users should continue using Copilot through other supported Microsoft 365 applications until the patch is deployed. The company emphasized that the issue is temporary and a fix is in progress.
Context: Microsoft’s Aggressive AI Push
This incident highlights Microsoft’s intense focus on integrating AI into its productivity suite, even as it rolls out features to Outlook Classic. The company recently added the Copilot button to the Ribbon and is preparing to introduce a new flyout for generating emails directly from the compose box. Additionally, users can soon double-click text in Outlook to request AI explanations, further embedding Copilot into daily workflows. These features aim to streamline tasks like summarizing threads, drafting responses, and organizing schedules.
Despite these advancements, the bug serves as a reminder of the challenges in maintaining legacy applications while introducing complex new features. Microsoft confirmed it is aware of the problem and plans to release a fix in the coming days, aiming to restore full Copilot functionality for affected users. The support document was first spotted by Windows Latest, which provided early details on the issue.
What This Means for You
If you rely on Outlook Classic for your daily tasks, this bug could disrupt your workflow, especially if you depend on Copilot for drafting emails or summarizing threads. For now, consider using Outlook on the web as a temporary alternative. Keep an eye on your update notifications for the upcoming patch that should resolve the issue. Users with affected licenses should verify their status and report any persistent problems to Microsoft Support.
Source: Windows Latest
Over to you: Have you experienced the Copilot bug in Outlook Classic, and did the workarounds help restore your workflow?
You may also like
Microsoft August 2026 Patch Tuesday Brings 751 Fixes, Including an Exploited WinSock Flaw
AMD Pushes New AMD Chipset Driver 8.08.12.551 to Unlock Ryzen AI Max Support
Microsoft Releases New Release Preview Channel Builds for Windows Insiders
Copilot Notebooks Now Supports Markdown and Additional Text File Formats
