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I'm attempting to install Outlook (PWA) at the computer level or via group policy or via registry edit. I need users to be able to click mailto links and have Outlook (PWA) pop up for them to either sign into or use.

Installing Outlook (PWA) manually and setting Outlook (PWA) as the default mailto app works if done manually but I need this automated for all users.

Background is that the user profiles are temporary and I need this set at either the machine level or upon first login. I can't use the full version of Outlook for this. I would be willing to use office365 version if possible.

Below is what I have so far. It kind of works. When clicking a mailto link, it doesn't do anything. It doesn't even prompt for which app to use.

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge String Name = WebAppInstallForceList Value = [{"fallback_app_name": "Outlook (PWA)","default_launch_container": "window","url": "https://outlook.office.com"}]

It installs an app with the name of Outlook (PWA) and the correct URL. However though, if you directly navigate to Outlook, it still prompts you to install Outlook (PWA). Also, it gives you the option to open the Outlook (PWA) app that was force installed.

I also have the protocol handler registered for Outlook to handle mailto links.

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

I'm missing a method of getting this force installed PWA app to be the default app for mailto.

ProgID for this Outlook PWA app is inconsistent so I can't use an xml for default file association. I'd prefer the xml method, if someone can think of a way to make it work.

Any assistance in trying to find a solution would be greatly appreciated.

DavidPostill
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Ender_sys
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2 Answers2

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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

Faery
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  • Unfortunately the given example is the manual method that wouldn't work for all users. I'm not sure if there's a known solution for my question. – Ender_sys Jan 05 '23 at 03:22
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Did you ever get a valid answer to your question, or were you able to figure this out?

I noticed Faery's response which doesn't help.

I have the issue I'm facing, just curious if you were able to get it working or not.

Thanks, Paul

PaulWatson
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    As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Mar 09 '23 at 20:00