Microsoft just dropped Windows 11 Insider Preview Build 26220.6690 into the Dev Channel, and the marquee addition is a pushy little button: "Share with Copilot." Hover over any app icon on the taskbar, and that option now peers out from the thumbnail preview, offering to hand the entire window's contents to Microsoft's AI assistant in a single click. The feature is a controlled rollout, meaning even Dev Channel Insiders won't all see it immediately, but its appearance after months of Copilot Vision groundwork signals exactly how aggressively Microsoft wants to weave AI into the fabric of the operating system.

A New Button Lands on the Taskbar

In current stable versions of Windows 11, hovering over a taskbar icon shows a thumbnail of the app window along with a close button. With the September 19, 2025 Dev build, Insiders who are part of the experiment may also see a "Share with Copilot" button right inside that pop-up. It sits beside the close control, mirroring the way a Teams share option can appear in the same space when you're in a call.

Microsoft's blog post describes it as a trial, and the company is explicitly asking for feedback before deciding whether to ship it broadly. Because the rollout is throttled through Controlled Feature Rollout, not even every Dev Channel machine will have the button at first. You can improve your odds by toggling on "Get the latest updates as soon as they're available" in Windows Update, but there's no guarantee. The build also includes a new on-screen text translation feature, but the taskbar button is the headline act.

How "Share with Copilot" Actually Works

That button is a shortcut to Copilot Vision, the part of Microsoft's assistant that can "see" what's on your screen. Previously, firing up Vision meant opening the Copilot app, clicking a Vision icon, and then picking a window or your desktop to share. The new taskbar affordance collapses those steps into one: hover over the app you want analyzed, click "Share with Copilot," and the system immediately starts a Vision session scoped to that window.

From there, Copilot scans the visual contents—a spreadsheet, a photo, a web page, a media player—and returns contextual information. If you share an Excel workbook, it can summarize the data. If you share a music app, it can identify the song. If you share a photo, it can tell you what's in the picture. After the initial analysis, you keep chatting in the Copilot pane, asking follow-up questions or requesting that it simplify something complicated.

Vision also supports a "Highlights" feature that can literally point at UI elements to coach you through a task. And the underlying engine can already handle multi-app and full-desktop sharing, so the taskbar button is just the newest—and lowest-friction—entry point to an existing set of capabilities.

What This Means for Everyday Users

The upside is genuine speed. If you need quick help understanding something on your screen, you don't have to switch contexts, explain the problem from scratch, or navigate through the Copilot interface. One click from the taskbar gives the assistant the exact visual input it needs, and the response appears right there. This can be a real productivity boost for occasional users who just want an answer without digging through menus or documentation.

But the convenience comes with a privacy hazard built into the interaction design. The button appears whenever you hover over any app icon—banking software, a password manager vault, a private email client. The action is so easy that it's imaginable someone could click it reflexively, sharing sensitive contents before they fully register what they've done. Microsoft says that users "must explicitly share the content" and that Copilot only processes what's sent, but the UI pattern itself is an invitation to share quickly, not deliberately.

There are real-world scenarios where that's a problem. Imagine a home user doing taxes in a browser, hovering to switch windows, and accidentally clicking "Share with Copilot." The assistant now has a snapshot of their income, social security number, and filing status. Microsoft's privacy documentation states that uploaded files are deleted after a period—the FAQ references a 30-day retention window—and that uploads aren't used to train generative models unless the user opts in. But the data still hits a server somewhere, and that alone may be more exposure than many people would knowingly accept.

For Power Users and IT Administrators: A New Governance Surface

In enterprise environments, the taskbar button is more than a convenience tweak; it's a potential data exfiltration path. Copilot Vision processes screen content in the cloud, and any user who can click that button can send proprietary information—code, contract terms, customer lists—outside the organization's perimeter without a second thought. Even if your tenant currently blocks or doesn't deploy Copilot, this Insider build is a preview of what may come to broadly available Windows 11 versions later.

Microsoft has built some guardrails. The assistant won't activate unless a user explicitly shares, and the Copilot app includes permission toggles for File Search and Vision. Administrators have documented controls: AppLocker can block Copilot executables, Group Policy can restrict behavior, and the Microsoft 365 Apps admin center includes settings to prevent the planned automatic installation of the Microsoft 365 Copilot app in fall 2025. For managed devices, there are also tenant-level controls that govern Copilot availability.

Still, the tightness of those controls varies by region—many Copilot features are U.S.-only during rollout—and they shift with Insider flights. IT teams need to audit what their users can see right now, project what they'll see after the next feature update, and update acceptable-use policies to explicitly mention screen-sharing Copilot interactions. Training should include concrete examples: a screenshot of the taskbar button next to a sensitive document, so users recognize the risk.

How We Got Here: Copilot's Growing Footprint

The "Share with Copilot" button didn't appear in a vacuum. Microsoft has been layering Copilot into Windows for over a year, starting with a slide-out pane and escalating to system-level hooks in File Explorer, Paint, and even dedicated keys on new keyboards. Over the course of 2025, Copilot Vision moved from browser-only experiments to a full desktop-sharing facilitator with multi-app support and guided highlights. Each new entry point makes the assistant harder to ignore.

The strategy is clear: make Copilot as reachable as the Start menu or the notification area, so that asking an AI for help feels as natural as checking the time. The taskbar, as the nerve center of daily Windows use, is the most valuable real estate for that kind of nudge. Microsoft wants users to think "I'll ask Copilot" in the same reflexive way they think "I'll minimize this window."

That approach increases feature adoption, but it also normalizes sharing potentially sensitive visual data with a cloud service. The upcoming Microsoft 365 Copilot app auto-install this fall will amplify the effect, placing AI entry points beside Word and Excel on millions of business desktops. The taskbar button is a warm-up act for a much larger deployment.

What to Do Now: Practical Steps for Every Audience

Whether you're a cautious home user, a power user who wants to strip Copilot from your machine, or an IT admin responsible for a fleet, there are immediate actions you can take—keeping in mind that Insider builds are previews and that final UI and settings may change.

If You're a Home User

  1. Check your Insider status. If you're not on the Dev Channel, you won't see this button yet. If you are, look for it when hovering over taskbar icons.
  2. Open the Copilot app and head to Settings > Permissions. Toggle off File Search and Vision if you don't want those features available. You can always turn them back on later.
  3. Delete your Copilot conversation history periodically if you've shared anything sensitive. Microsoft's retention period doesn't guarantee immediate deletion from all logs.
  4. Be mindful of what's on your screen before you click that button. If you wouldn't email a screenshot to a stranger, don't share it with Copilot.

If You're a Power User

  1. Uninstall the Copilot app via Settings > Apps > Installed apps, or use PowerShell: Get-AppxPackage *copilot* | Remove-AppxPackage. Note that builds can reinstall it, so you may need to repeat this after major updates.
  2. Block Copilot executables with AppLocker or a third-party firewall rule if you want a more persistent solution.
  3. Monitor taskbar personalization settings (Settings > Personalization > Taskbar). Microsoft sometimes adds Copilot-specific toggles there; the location and naming shift between builds.
  4. Test in a virtual machine first if you're considering broader deployment tactics.

If You're an IT Administrator

  1. Audit your tenant's Copilot configuration right now. Verify whether Copilot Vision is enabled and which devices are eligible (U.S. vs. EEA, Copilot+ PC distinctions matter).
  2. Prevent the fall 2025 automatic install of the Microsoft 365 Copilot app by configuring the Microsoft 365 Apps admin center or using Group Policy. Microsoft has published documentation on these controls; review and test them before they become urgent.
  3. Add Copilot Vision to your acceptable use policy and hold a targeted training session that shows exactly what the taskbar button looks like and explains the risks of sharing sensitive windows.
  4. Use AppLocker or endpoint management to block Copilot on devices where it's not appropriate. The executable names and paths may vary by build, so maintain a test ring to keep your rules current.
  5. Watch Microsoft's Insider blog for changes. The button could be pulled, modified to include a confirmation prompt, or expanded to more channels. Your governance plan must be flexible.

Outlook: The AI Ubiquity Dilemma

Microsoft will almost certainly gather telemetry on how Insiders use the "Share with Copilot" button—and how many accidentally click it—before deciding its fate. If feedback leans negative, the company could add an extra confirmation step or restrict the feature to certain app categories. If feedback is positive, expect it to graduate to the Beta and Release Preview Channels, and eventually to all Windows 11 users, likely as part of the 2025 fall feature update.

More broadly, this button is a microcosm of the AI integration challenge across the industry. Making assistants helpful means making them fast and easy to access. But ease of access, without equally easy control, erodes user agency. The next few months will show whether Microsoft treats the taskbar button as a learning opportunity—or just the next step in a march toward unavoidable AI.