Hi @Jérôme Lucas ,

Welcome to our forum!

Based on my test in Chrome, after I logged in to outlook.office.com, I can install the Outlook PWA successfully. Which install button do you mean? Is it in the below figure?

In order to further confirm if the issue is related to Chrome, it's suggested that you could try in other browser(such as Edge) to check if you can install PWA successfully.


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Answer from ChristyZhang-MSFT on learn.microsoft.com
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University of Tennessee
oit.utk.edu › home › news › outlook (pwa): a streamlined way to access your email
Outlook (PWA): A Streamlined Way to Access Your Email | Office of Innovative Technologies
August 22, 2025 - Click on the three-dot menu in the top-right corner of your browser window. If Outlook (PWA) is not installed on your system, select More Tools > Apps > Install Outlook (PWA).
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Microsoft Store
apps.microsoft.com › detail › 9nrx63209r7b
Outlook for Windows - Free download and install on Windows | Microsoft Store
October 21, 2025 - The new Outlook for Windows is a best-in-class email experience that is free for anyone with Windows. Easily connect and coordinate your personal and work email accounts and calendars in one app. Write clear, concise mails and get intelligent suggestions with built-in AI.
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TeamDynamix
utk.teamdynamix.com › TDClient › 2277 › OIT-Portal › KB › PrintArticle
Accessing An Email Through Outlook (PWA)
August 26, 2025 - Microsoft Outlook Progressive Web App (PWA) offers a seamless way to access your email directly from your browser, eliminating the need for a traditional desktop application. If you’ve been looking for a way to declutter your desktop while maintaining quick access to your email, replacing ...
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It looks like manually installing Outlook as a PWA from within Edge registers the PWA as a protocol handler for "mailto" in Windows; however, using the GPO/Registry to install does not. There are several other differences to the way it is installed if you do it manually vs GPO/Registry as well. Here is the solution I got to work for me.

1. Configure Outlook PWA Installation and register protocol handler in Edge

Here is the registry. You can also configure this with GPO if you download the MSEdge templates.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge]
"WebAppInstallForceList"="[{\"custom_name\": \"Outlook\", \"install_as_shortcut\": true, \"create_desktop_shortcut\": true, \"default_launch_container\": \"window\", \"url\": \"https://outlook.office.com/mail\",\"custom_icon\": {\"hash\": \"E35D94B76894D6ECA96FF5B1A12D94DFE73485EF3C52CB5B4395BE8FFAC1CB45\", \"url\": \"https://outlook.office.com/mail/favicon.ico\"}}]"

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\Recommended]
"RegisteredProtocolHandlers"="[{\"url\": \"https://outlook.office.com/mail/deeplink/compose?mailtouri=%s\",\"default\": true,\"protocol\": \"mailto\"}]"

2. Add the Outlook PWA as a protocol handler for "mailto" in Windows.

Download an Outlook .ico file and save it as C:\ProgramData\OutlookPWA\Outlook.ico. This file is referenced in the registry entries below as the icon for when you select the Outlook PWA as the default app in Settings.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA]
@="OutlookPWA"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\Application]
"ApplicationIcon"="C:\\ProgramData\\OutlookPWA\\Outlook.ico,0"
"ApplicationName"="OutlookPWA"
"ApplicationDescription"="Outlook Progressive Web Application"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\DefaultIcon]
@="C:\\ProgramData\\OutlookPWA\\Outlook.ico,0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\shell\open\command]
@="\"C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge_proxy.exe\" --profile-directory=Default --app=https://outlook.office.com/mail/deeplink/compose?mailtouri=%1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\shell\runas]
"ProgrammaticAccessOnly"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OutlookPWA\shell\runas\command]
@="\"C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge_proxy.exe\" --profile-directory=Default --do-not-de-elevate --app=https://outlook.office.com/mail/deeplink/compose?mailtouri=%1"

[HKEY_LOCAL_MACHINE\SOFTWARE\RegisteredApplications]
"OutlookPWA"="Software\\Clients\\Mail\\OutlookPWA\\Capabilities"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA]
@="OutlookPWA"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\Capabilities]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\Capabilities\URLAssociations]
"mailto"="OutlookPWA"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\DefaultIcon]
@="C:\\ProgramData\\OutlookPWA\\Outlook.ico,0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\OutlookPWA\shell\open\command]
@="\"C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge_proxy.exe\" --profile-directory=Default --app=https://outlook.office.com/mail/deeplink/compose?mailtouri=%1"

3. Set the default app association.

Create an XML file that contains the default for mailto (Set to OutlookPWA). Feel free to add any other defaults you want to this file.

<?xml version="1.0" encoding="UTF-8"?>
<DefaultAssociations>
  <Association Identifier="mailto" ProgId="OutlookPWA" ApplicationName="OutlookPWA" />
</DefaultAssociations>

Import default app associations from that XML file either by GPO (Computer Configuration > Policies > Administrative Templates > Windows Components > File Explorer > Set a default associations configuration file) or with DISM. Dism will only apply to new users. It will not set defaults for existing users. If you need to set the default for existing users on the PC you will need to use the GPO.

Dism - Apply to Image

Dism /Image:YourImage /Import-DefaultAppAssociations:YourXMLFile

Dism - Apply to already imaged computer

Dism /Online /Import-DefaultAppAssociations:YourXMLFile

That's it!

Bonus: If you actually use Edge and you don't want it to pop up asking if you want to allow this website to open a program when you click a mailto link, use either of the following:

Machine

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ProtocolExecute\mailto]
"WarnOnOpen"=dword:00000000

User

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\ProtocolExecute\mailto]
"WarnOnOpen"=dword:00000000
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You should be able to specify Outlook.com as the default mail handler by following the guidance here: https://www.techradar.com/news/outlookcom-can-now-be-your-default-email-client

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Megan V. Walker
meganvwalker.com › using-the-outlook-web-app-as-a-desktop-app
Using The Outlook Web App As A Desktop App -Megan V. Walker
January 28, 2022 - It essentially takes what we see ... You can also get to it by clicking on the ellipsis from the top of the browser, then clicking on Apps, then you should see Install Outlook (PW) as an option....
Find elsewhere
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SYNERINSOFT
synerinsoft.com › blog-en › news › outlook-pwa-a-new-era-in-email
Outlook PWA: a new era in email
May 30, 2023 - Step 1: Open your browser and navigate to outlook.com or visit the Office 365 home page. Step 2: Whichever path you choose, the next step is to log in to your Microsoft account. Step 3: Different web browsers will have different icons indicating ...
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Peter Vanderwoude
petervanderwoude.nl › post › easily-installing-progressive-web-apps
All about Microsoft Intune | Easily installing Progressive Web Apps
May 16, 2022 - This week is not something completely new, but more something nice to be aware of. This week is all around Progressive Web Apps (PWAs) and easily and automatically installing them on Windows devices. The great thing about a PWAs is that they're basically websites that are enhanced to function like installed, native apps on supporting platforms,…
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Reddit
reddit.com › r/intune › deploying outlook web as a pwa app via edge
r/Intune on Reddit: Deploying Outlook Web as a PWA app via Edge
December 15, 2024 -

Just wondering if anyone has had success doing this?

Our organization is changing and most of are users will be on F3 licenses.

Most of our users cannot update the built-in Mail app on Win10/11 to Outlook New as we block the MS Store.

So the solution to that is we create a PWA for Outlook for each user that calls in but I would prefer to automate this and push out to all users or prefer to target ones that have F3 license only.

I did use some online resources but they do not appear to work for me.

Deploying Remote Apps with Intune | Remote Desktop > uses JSON I think to do this

Deploying Office WebApps (PWA) with file handlers via Intune – Andrew Taylor > this is the one I tried

I've created the Configuration Profile in Intune and used these settings for Microsoft Edge:

Microsoft Edge

------------------------------------------------------------------------

Configure list of force-installed Web Apps (User)

Enabled

URLs for Web Apps to be silently installed. (User)

[ { "url": "https://www.outlook.office.com/mail", "custom_name": "Outlook(PWA)", "create_desktop_shortcut": true, "default_launch_container": "window", "fallback_app_name": "Outlook PWA", } ]

Issue - I get the shortcut on the desktop but when I launch it I get a DNS error instead.

EDIT - I asked CoPilot to review my syntax and it found that I had an extra comma after the fallback_app_name so now I got it working. Unfortunately in order to auto-pin to task bar I would have to combine it with a Powershell script.

Correct JSON syntax when you make the profile should be like this:

[
  {
    "url": "https://outlook.office.com/mail/",
    "custom_name": "Outlook (PWA)",
    "create_desktop_shortcut": true,
    "default_launch_container": "window",
    "fallback_app_name": "Outlook PWA"
  }
]
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Google Play
play.google.com › store › apps › details
Microsoft Outlook - Apps on Google Play
10.4M reviews · 1B+ Downloads · Everyone · info · Install · Share · Add to wishlist · play_arrowTrailer · arrow_forward · Connect and coordinate your busy life with Microsoft Outlook . Stay on top of your day through a secure email and calendar app that lets you manage your emails, files and calendar all in one place.
Rating: 4.4 ​ - ​ 10.4M votes
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Microsoft Support
support.microsoft.com › en-us › office › start-using-new-outlook-for-windows-4395454d-cb2f-4c16-bb24-fa4bb36650ae
Start using new Outlook for Windows - Microsoft Support
However, if you're running a supported version of Windows, you can do the following to install new Outlookfrom the Microsoft Store. Note: To download new Outlook, you must be running Windows 10 version 17763.0 or later.
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Reddit
reddit.com › r/sysadmin › microsoft's new outlook & new teams pwa
r/sysadmin on Reddit: Microsoft's New Outlook & New Teams PWA
April 25, 2024 -

I was having a conversation with a colleague at work today over a weird issue with the new Microsoft Teams application. It got us on the topic of progressive web applications and sideloading. The new Outlook and Teams have features that require Edge to be installed, along with a newer application, Microsoft Edge WebView2 Runtime. In my opinion, I think Microsoft will move the entire Office Suite to this as Google has done from the start with G Suite.

I'm curious about what others think. Do you think the new Outlook and Teams are now progressive web applications? Or am I just wrong in general?

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Zoom
support.zoom.com › hc › en › article
Installing the Zoom for Outlook add-in
January 14, 2025 - The Zoom for Outlook add-in allows you to manage scheduling within the Outlook web and desktop apps.
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Tigren
tigren.com › home › general › outlook pwa: navigating the future of web innovation
Outlook PWA: What You Can Learn From - Tigren
August 5, 2025 - The Outlook PWA support is available if you’re using a Chromium-based browser like Chrome or Edge. ... Sign in to Outlook on the web or Outlook.com account. Select Settings and more at the top of the window.
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Chrome Unboxed
chromeunboxed.com › chrome unboxed - the latest chrome os news › apps › news › how to install microsoft outlook on a chromebook as a pwa
How to install Microsoft Outlook on a Chromebook as a PWA
December 9, 2019 - Head to outlook.com, sign in, and then you can install the app by hitting the plus sign in the right side of your URL bar or clicking Chrome’s 3-dot menu and selecting “Install Outlook.” In general, this won’t do much more than Outlook on the web did before, but installing the PWA will allow the app to be listed alongside your other apps and pinned to your tray. Oh, and it will open up in its own window as well, giving way to a more native app experience.
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Softonic
microsoft-outlook.en.softonic.com › home › windows › productivity › e-mail clients › microsoft outlook
Microsoft Outlook - Download
December 4, 2024 - Microsoft Outlook, free and safe download. Microsoft Outlook latest version: Download Microsoft Outlook for Windows: Sending emails and scheduling jus
Rating: 6.5/10 ​ - ​ 3.16K votes