The Tool Desk
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1. Check whether the known classic Outlook issue applies
Microsoft reports that after classic Outlook for Windows updates to build 20026.20182 or later, Copilot Chat or other Copilot entry points may disappear for people with Copilot Chat (Basic) or M365 Copilot (Premium). Symptoms include a missing button above the ribbon, a missing icon in the left app bar or More Apps area, an item under Add Apps that does nothing when opened, or a grayed-out Copilot ribbon command. Microsoft attributes its investigation to Outlook being unable to locate the MAPI property PR_PROFILE_USER_SMTP_EMAIL_ADDRESS_W within the null profile section, which can prevent the Copilot component from saving related settings. The issue notice remains marked Investigating; Microsoft has not given a resolution date. Check Microsoft’s current notice for status changes.
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Use one of Microsoft’s listed workarounds
- Switch clients: Open new Outlook or Outlook on the web. This is the quickest route if your account and organization support the feature.
- Create a new classic Outlook profile: Set up a fresh profile, then open Outlook with it and check whether Copilot appears.
- Enable apps in Outlook: In classic Outlook, go to File > Options > Advanced. Under Outlook panes, select Show Apps in Outlook.
Microsoft lists these as workarounds, not a guaranteed repair. The issue applies to classic Outlook for Windows; it should not be assumed to affect every Outlook client. Microsoft’s issue index also lists the missing-buttons problem as under investigation. See the classic Outlook issue index.
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A missing button can also mean the signed-in account does not have the entitlement for the feature you expect, or that an organization controls access. For a work or school account, check the Copilot label shown under your name on the Microsoft 365 home page. Microsoft identifies labels including Copilot Chat (Basic), M365 Copilot (Basic), and M365 Copilot (Premium); what each label enables differs. If you cannot see the label or are unsure what it includes, ask your Microsoft 365 administrator to confirm your assigned license and any organizational policy. Microsoft explains how to identify a Copilot license.
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For a personal Microsoft account, a qualifying subscription is required. In desktop apps, Copilot is available only to the subscription owner, so check that Office is signed in with the account that owns the subscription.
3. Update Microsoft 365 and refresh the license
If the known-issue workaround does not fit, install the latest available Microsoft 365 build, then refresh the license and restart the apps:
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- In an Office app, select File > Account > Update License.
- Close and reopen the Microsoft 365 apps you were using.
- Check for updates and install any available update for your Outlook client.
For business deployments, Microsoft says Copilot features are unavailable in the Semi-Annual Enterprise Channel. Its guidance calls for the Current or Monthly Enterprise Channel; contact your help desk rather than changing a managed update channel yourself. See Microsoft’s missing-button guidance.
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Outlook Copilot scenarios have mailbox limitations that can make a button or feature unavailable even when your account has Copilot access:
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- Copilot scenarios in Outlook are limited to your primary mailbox.
- Archive, group, shared, and delegate mailboxes are not supported for these scenarios.
- The mailbox must be hosted on Exchange Online; a mailbox hosted elsewhere is not supported.
- Work-or-school Copilot Chat is supported only in new Outlook for Windows or Outlook on the web, according to Microsoft’s FAQ.
If the feature works in your primary mailbox but not while viewing a shared or delegated mailbox, that difference is consistent with the stated limits. Read Microsoft’s Outlook Copilot FAQ.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Review Connected Experiences privacy settings
Copilot access across Outlook apps requires Connected Experiences not to be turned off. Review your Microsoft 365 privacy settings and, on a managed account, ask your administrator whether an organization policy disables connected experiences. Microsoft also says its connected-account sharing capability is not available in classic Outlook for Windows; that limitation is separate from the missing-buttons investigation. Microsoft’s Connected Experiences guidance.
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6. Choose a route if Copilot is still unavailable
| Route | Best when | What to know |
|---|---|---|
| New Outlook or Outlook on the web | You need to reach Copilot without waiting for classic Outlook troubleshooting. | Microsoft lists both as workarounds for the classic Outlook issue. Your account, mailbox, and organization still need to support the relevant feature. |
| New classic Outlook profile | You must remain in classic Outlook and can set up a separate profile. | Microsoft lists this as a workaround; it does not publish a success rate or guarantee. |
| Turn on Show Apps in Outlook | You want to stay in classic Outlook and the apps display setting is available. | Use File > Options > Advanced > Outlook panes, then enable Show Apps in Outlook. |
| Contact your administrator | Your account is managed, or license, policy, mailbox hosting, or update channel is uncertain. | Ask IT to verify entitlement, organizational settings, Exchange Online mailbox status, and the Microsoft 365 update channel. |
If the issue continues, use new Outlook or the web client if permitted, and have your administrator check managed settings. Microsoft’s cited notice does not state when a permanent fix will be available.
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