Breaking

Microsoft Fixes Vanishing Copilot Buttons in Classic Outlook for Windows

July 2, 2026 at 18:43 EDT

AI Agents
Sales & Business

Microsoft has confirmed and fixed a defect that caused Copilot-related buttons to disappear in classic Outlook for Windows, rolling out a server-side change on June 29, 2026. Only users holding a Copilot Chat (Basic) license were affected, while those with a Microsoft 365 Copilot (Premium) license saw no impact.

June 29, 2026 · Microsoft 365

Microsoft Fixes Bug That Made the Copilot Button Vanish in Classic Outlook

A flaw in license-validation logic stripped the Copilot Chat button from classic Outlook for Windows — but only for free-tier users. A server-side fix restored it, no client update required.

Basic

Only free-tier Copilot Chat users hit the bug

Server-side

Fix applied with no client update needed

June 30

Marked resolved on the support page

Two tiers, one bug — who was affected

License validation is the gatekeeper for every AI feature.

Bug: BUTTON GONE

Web data + uploaded files

Included in M365

Copilot Chat (Basic)

Free tier · affected

Not affected

Email · meetings · files

Full organizational data

Add-on ≈ $30/user/mo

M365 Copilot (Premium)

Paid tier · unaffected

How it broke — and got fixed

Build 20026.20182+

Update introduced a license-validation flaw

→

Button vanishes

Ribbon + nav icons gone, command greyed out

→

Server-side fix

Restart Outlook to recover — no client update

Handled well

Switching to Outlook on the web sidestepped the issue, and the server-side fix restored the button immediately — no reinstall.

Open questions

Others flagged the fragility of license validation and the stability of AI features being pushed hard across M365 apps.

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