Using classic Outlook for Windows in business environments
Dear @Adela-1413,
Based on your description, the Summarize button in Outlook Classic is a Microsoft 365 Copilot feature. An Office 365 E3 license alone does not provide Copilot functionality. The user must also have a valid Microsoft 365 Copilot license assigned.
If both users have the same Outlook version (2608 / 20326.20100) and appear to have the same licensing, please verify the following:
- Confirm Microsoft 365 Copilot licensing
- Ask your admin go to Microsoft 365 Admin Center > Users > Active users.
- Select the affected user and verify that a Microsoft 365 Copilot license is assigned and provisioned.
- Verify Connected Experiences are enabled
- In Classic Outlook, go to: File > Office Account > Account Privacy > Manage Settings
- Ensure that connected experiences are enabled, as Copilot features depend on these settings.
Additionally, It may be missing in Classic Outlook despite the user having a valid license. If all settings and licensing are confirmed, the issue could be related to a service-side rollout or a known product issue currently under investigation.
For more detailed information Copilot buttons are missing in classic Outlook for Windows
I hope this helps, if you have any other questions, please feel free to reach out.
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