Microsoft has fixed a known issue that removed the Copilot Chat and Copilot buttons in the classic Outlook desktop mail client for some Windows users. Those impacted by this issue experienced one or more of the following issues: the Copilot button missing from the top-right area above the ribbon, the Copilot icon missing from the left app bar or More Apps area, and the Copilot command appearing as unavailable or grayed out when using ribbon customization. Microsoft recommends following the guidance in Copilot troubleshooters and How to find and enable missing Copilot button in Microsoft 365 apps to identify and resolve the issue. If you are still affected by this known issue, you can enable the 'Show Apps in Outlook' option in classic Outlook settings by selecting the File tab, then going to Options > Advanced and checking the 'Show Apps in Outlook' box under 'Outlook panes'. Alternatively, you can use the new Outlook email client or Outlook Web Access (OWA), which are not affected by this bug, or create a new Outlook profile. Microsoft has also provided a temporary workaround for those still affected by this known issue.
