Outlook for Windows users still waiting for vanished Copilot controls
Microsoft continues to investigate a defect that removes Copilot and Copilot Chat buttons from the classic Outlook interface for some Windows users. The problem appears after upgrading to build 20026.20182 or later, and Microsoft has linked it to a missing MAPI property that prevents Copilot settings from persisting. Until a permanent fix is ready, users can enable the 'Show Apps in Outlook' option, create a new profile, or switch to the new Outlook or web version.
The defect stems from a missing MAPI property that prevents Copilot-related settings from being stored in affected Outlook profiles. Microsoft's investigation points to the PR_PROFILE_USER_SMTP_EMAIL_ADDRESS_W property, which the Outlook Copilot component relies on to persist configuration data. Without it, the entry points vanish from navigation.
Microsoft has offered several interim remedies while developing a permanent solution. Users can toggle the "Show Apps in Outlook" setting under Advanced options, create a fresh profile, or migrate to the new Outlook client or web access. The article also notes separate recent fixes for Teams Meeting Add-in crashes and Outlook.com sending failures.
This issue could disrupt workflows for business users who depend on Copilot's AI assistance within their email client. Organizations with mixed license types may see inconsistent experiences across their workforce, potentially slowing adoption of Microsoft's AI tools. While workarounds exist, they require technical proficiency, which may leave less experienced users without access until Microsoft delivers a permanent fix. The broader implication is that even established software can face integration challenges when layering AI features onto legacy architecture.