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Microsoft Investigates Classic Outlook Bug That Hides Copilot Buttons

September 16, 2026 at 08:29 EDT

Sales & Business
AI Agents

Microsoft says a classic Outlook for Windows bug can still hide Copilot and Copilot Chat entry points for some licensed users, and the company has not issued a permanent fix. The issue appears after build 20026.20182 and higher and affects users with Copilot Chat (Basic) or paid M365 Copilot (Premium) accounts.

Sep. 15, 2026 · Microsoft

Copilot buttons vanish in classic Outlook

A classic Outlook for Windows bug can hide Copilot Chat and Copilot entry points after build 20026.20182 and higher. Microsoft says the issue affects Copilot Chat (Basic) and M365 Copilot (Premium) accounts.

20026.20182+

Classic Outlook build range affected

Copilot account tiers named

Temporary workaround routes

2029+

Classic Outlook support window

From one broken path to three workarounds

affected classic client path

documented temporary routes

The workaround set is larger than the affected client path, but none is a permanent repair.

Where the failure sits

Classic Outlook updates

→

Profile property is not found

→

Copilot settings do not persist

→

Navigation entry point disappears

Why some teams care

Copilot is expected to appear inside classic Outlook for licensed users who rely on that client.

Why others shrug

Copilot button placement has drawn pushback elsewhere, but this case is a bug rather than a user-controlled decluttering option.

What users can do now

Setting

Enable Show Apps in Outlook.

Profile

Create a new Outlook profile.

Client

Use new Outlook or OWA temporarily.

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