How to Stop the Try the New Outlook Toggle Appearing

How do you stop the Try the new Outlook toggle appearing?#

Two settings do this, and which one you need depends on whether you are fixing one PC or a fleet. On your own machine, open classic Outlook and go to File, Options, General, New Outlook options, then clear the checkbox marked Automatically switch me to new Outlook.

That stops the automatic switch but leaves the toggle on screen. To remove the toggle itself, set the registry value HideNewOutlookToggle to 1 under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General and restart Outlook.

Managing more than a few machines? Skip the registry. Microsoft publishes a cloud policy named Hide the "Try the new Outlook" toggle in Outlook in the Microsoft 365 Apps admin center, and the same setting as an ADMX you can push through Intune or Group Policy. Those stick. A hand-edited value on each PC does not.

This is a supported choice, not a stalling tactic. Microsoft supports existing classic Outlook installs through perpetual and subscription licensing until at least 2029, and no cutover date has been announced.

Which Outlook are you actually looking at?#

Getting this wrong wastes an afternoon. Check the top right of the window first.

• Classic Outlook for Windows — the toggle reads Try the new Outlook. Every setting in this article applies to this client.
• New Outlook for Windows — the toggle reads New Outlook, and turning it off returns you to classic immediately.
• Outlook on the web — no toggle, nothing to suppress.
• Outlook for Mac — a separate application. None of the Windows registry paths below exist on macOS.
• Windows Mail and Calendar — support ended on 31 December 2024 and active users were moved to new Outlook. Removing the app is the fix there.

Stop it on your own PC#

One machine, no admin console, about five minutes. Order matters, because the first step depends on which app you are sitting in right now.

1. 1

   Get back to classic Outlook first

   If Outlook opened into the new experience this morning, turn off the New Outlook toggle at the top right, or pick Go to classic Outlook from the Help tab. Classic opens straight away and both apps stay installed.

2. 2

   Clear the automatic switch checkbox

   In classic Outlook: File, Options, General, New Outlook options. Uncheck Automatically switch me to new Outlook, then click OK. Microsoft notes that if the option is not there, your account is not currently eligible for an automatic switch, so there is nothing to turn off yet.

3. 3

   Set HideNewOutlookToggle to 1

   The checkbox stops the switch; only this removes the toggle. In Registry Editor, go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General and create a DWORD named HideNewOutlookToggle with data 1. One hides it, zero shows it. The 16.0 is the Office major version and is correct for Microsoft 365 — it is not a year.

4. 4

   Restart Outlook, then restart Windows

   Classic Outlook reads the value at launch. Microsoft notes that the logic pulling a user back out of new Outlook runs when the key is read, typically at a computer restart, so a reboot is the real test.

5. 5

   Pin classic Outlook and unpin the other one

   They are separate applications with separate icons. Launching the new Outlook icon opens new Outlook whatever you set in the classic key.

6. 6

   Re-check after Office updates

   That value lives in the ordinary user hive, so an update, a repair or a profile change can clear it. If the toggle reappears, check it first.

User settings versus admin policies: what each one does#

Most pages give you one registry value and stop. There are several distinct controls, they do different jobs, and picking the wrong one produces the usual complaint that the fix did not work. All checked against Microsoft's documentation in July 2026.

The model that makes this coherent: three separate layers — whether the app is on the device, whether the user is prompted into it, and whether the mailbox will open in it. Hiding the toggle only touches the middle one.

Suppressing the toggle across an estate#

This is the version most people with a fleet behind them actually need, and it is where generic advice runs out. Work down the layers — most organisations need only the first three steps.

1. 1

   Check your Outlook build

   The setting arrives as a Group Policy object and needs a recent enough classic Outlook. Microsoft lists Current Channel 2304 (build 16327.20214) or later and Monthly Enterprise Channel 2303 (build 16227.20318) or later, with separate minimums for the preview and semi-annual channels.

2. 2

   Use Cloud Policy if you can

   At config.office.com, go to Customization, then Policy Management, then Create. Search for Hide the "Try the new Outlook" toggle in Outlook and enable it. Scope it to a security group and pilot before going wide.

3. 3

   Or push the ADMX through Intune or Group Policy

   Download the current Administrative Template files for Microsoft 365 Apps from the Microsoft Download Center and configure the setting under User Configuration. In Intune it is an Administrative Templates profile.

4. 4

   If you script the registry, use the Policies hive

   Microsoft documents HideNewOutlookToggle set to 1 under HKEY_CURRENT_USER\Software\Policies\Microsoft\office\16.0\outlook\options\general as the way to stop users changing the value back. The non-policy Office key does the same job, but users can undo it.

5. 5

   Turn off the automatic migration user setting

   The layer most people miss. Microsoft's policy is named Manage user setting for new Outlook automatic migration, and its registry equivalent is NewOutlookMigrationUserSetting under HKEY_CURRENT_USER\Software\Policies\Microsoft\office\16.0\outlook\preferences. Zero blocks automatic migration and prevents users re-enabling it.

6. 6

   Check nobody enabled admin-controlled migration

   The Admin-Controlled Migration to New Outlook policy (registry value DoNewOutlookAutoMigration) walks users through a callout, then a banner, then a blocking prompt, and a companion interval policy re-runs the whole sequence after they toggle back. If your users are nagged on a schedule, that pair is usually why.

7. 7

   Treat the app and the mailbox as separate decisions

   Hiding the toggle uninstalls nothing. Microsoft documents a Windows 10 registry value that blocks the preinstall, states there is currently no way to block it on Windows 11 builds later than 23H2, and provides Remove-AppxProvisionedPackage for the package Microsoft.OutlookForWindows. In Exchange Online, Set-CASMailbox or Set-OwaMailboxPolicy with OneWinNativeOutlookEnabled set to false stops the mailbox opening in new Outlook however the app was obtained.

8. 8

   Pilot, then verify on a real machine

   Apply to one test device, restart it, and confirm the toggle is gone and that no prompt fires across several launches. Policy refresh and app launch are both involved, so reopening Outlook once is not a valid test.

Why does the toggle keep coming back?#

If you have turned this off once already and it returned, one of these is why. The first three cover most cases.

What happens at cutover, and how long do you have?#

Microsoft's published model has three stages. Opt-in, where the toggle is offered and new Outlook is off by default. Opt-out, where new Outlook is on by default but users can still switch back. Cutover, where switching back is no longer possible.

Microsoft commits to at least twelve months of notice before each of the later stages reaches production rings. Microsoft's published timeline originally placed enterprise opt-out in April 2026; message centre post MC949965, updated 20 February 2026, moved it to 1 March 2027. That notice is tenant-scoped and does not appear on Microsoft Learn, so confirm the date in your own admin centre. As of July 2026 no cutover date has been announced, and existing classic installs through perpetual and subscription licensing are supported until at least 2029.

So hiding the toggle buys you years, not weeks, and you get a year's warning before the option disappears. Use that time on the work that decides your real switch date: auditing which COM add-ins, VBA macros and custom forms your people depend on, because none of those exist in new Outlook.

The short version#

One machine: uncheck Automatically switch me to new Outlook under File, Options, General, then set HideNewOutlookToggle to 1 in the Office user key if you want the toggle gone as well. Expect to re-check it after updates.

An estate: use the Hide the "Try the new Outlook" toggle in Outlook cloud policy or the matching ADMX, turn off the automatic migration user setting, confirm nobody enabled admin-controlled migration, and treat blocking the app and blocking the mailbox as separate decisions.

Disclosure, since you are on our site: we build AI Emaily, an email client for Outlook, Gmail and IMAP accounts. It does not fix this, and nothing above depends on it — if you want the toggle gone, the settings are the answer.