The classic Outlook desktop client has long been a staple for Windows power users, but Microsoft has spent the last several months aggressively nudging people toward its web-based successor. At the center of that push is the persistent “Try the new Outlook” toggle, which appears directly in the ribbon and settings menu of the legacy app. If you prefer to stick with the desktop-native experience, you can disable the new Outlook button with a simple registry adjustment.
Why Microsoft Pushes the New Outlook
Microsoft’s strategy here is straightforward: migrate users to a cloud-first, cross-platform email client that aligns with its broader Office 365 ecosystem. The new Outlook runs on a Chromium-based framework, shares a codebase with Outlook on the web, and prioritizes synced mailbox storage on Microsoft servers. While this architecture delivers faster load times and tighter Teams integration, it also introduces notable limitations. Add-ins that worked seamlessly in the desktop version often fail to load, offline mailbox access is restricted, and certain enterprise-grade features like advanced rules and custom forms remain unsupported. For users managing complex calendars, heavy PST archives, or specialized corporate workflows, the gap between the two clients is still wide enough to warrant caution.
What This Means for You
If you rely on the classic Outlook desktop client for day-to-day work, that promotional toggle can quickly become a source of accidental clicks. One wrong tap and your mailbox gets migrated to the cloud-only version, potentially disrupting local data sync, breaking legacy add-ins, or triggering a lengthy conversion process. Removing the toggle does not uninstall the new Outlook or block future updates—it simply stops the legacy client from advertising the switch. You will still be able to access the new version manually if you ever change your mind, but the classic interface will remain your default without constant prompts.
How to Disable the New Outlook Button
The fix requires a minor edit to the Windows Registry. Since the registry stores system-wide and user-specific configuration data, the change is scoped to your current account and will not affect other users on the same machine. Before making any edits, it is always wise to close the classic Outlook client entirely.
First, press the Windows key and type regedit into the search box. Click on the Registry Editor result to launch it. If User Account Control prompts you for permission, select Yes to proceed.
Next, navigate to the following path using the left-hand tree view: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General
Once you are in the General folder, right-click anywhere in the empty space on the right-hand pane. From the context menu, select New > DWORD (32-bit) Value. Name the new entry exactly HideNewOutlookToggle. The spelling and capitalization matter here.
Double-click the newly created key and change the Value data field from 0 to 1. Ensure the base is set to Hexadecimal or Decimal—both will work, but Decimal is more intuitive for this specific toggle. Click OK to save the change.
Close the Registry Editor and relaunch the classic Outlook. The “Try the new Outlook” button will no longer appear in the ribbon, settings, or top-right corner of the window.
Reverting the Change
Should you decide to give the new Outlook a try later, the process is just as straightforward. Return to the same registry path, open HideNewOutlookToggle, and change the value back to 0. Restart Outlook once more, and the promotional toggle will return to its default state. If you ever want to completely remove the key, you can delete it entirely—Outlook will simply ignore its absence and revert to the standard behavior.
What to Do Next
While you are in the registry editor, it is worth verifying that your existing add-ins and account configurations are functioning as expected. If you have been using the new Outlook in parallel, you can safely leave it installed; disabling the toggle only affects how the classic client presents the option. For enterprise administrators managing a fleet of Windows machines, this registry path can be deployed via Group Policy or Intune to standardize the user experience across your organization. Microsoft has acknowledged the switch in its official Office support documentation, confirming that the registry key is an officially recognized configuration toggle rather than a third-party workaround.
Source: PCWorld
Over to you: Are you keeping the classic Outlook desktop client for your primary workflow, or have you already made the jump to the new version?
