Disable Mail app in Windows 10 via GPO

Hello,

In our environment we have the problem that the default association for the mailto: protocol is not consistently set to open Outlook.

So many users who click a mailto: link will be presented with the Mail app instead of Outlook.
Then they end up logging in their Office 365 account in the Mail app.
Even if we set it manually to be Outlook after a while (probably after a CU update) it reverts back to the Mail app.

I can't seem to find a GPO to disable the Mail app completely.
I now ended up changing my default SCCM deployment to uninstall the Mail app but we still have about 1k devices with the app still installed.

Also, I'm pretty sure if we later this year start the upgrade to the latest W10 build the app will probably be installed again.

So, does anybody know how to disable this freaking thing via GPO?

Thank you
LVL 3
alohadinSEAsked:
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Cliff GaliherCommented:
There is no good way to do what you want. You cold prevent the app from running with applocker if all of your clients run enterprise, but mailto will still attempt to open the mail app and give the users a cryptic error.

Instead, use SCCM or group policy to remove the app from existing deployments. It need not only be done as an OSD option.
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Shaun VermaakTechnical Specialist IVCommented:
As stated above, please see my answer in previous question regarding Edge. Same applies for Mail App
https://www.experts-exchange.com/questions/29013547/Blocking-Microsoft-Edge-From-Running.html
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alohadinSEAuthor Commented:
We can't use AppLocker as we have Windows 10 Pro.

@Cliff
The cryptic error might indeed not be the best thing to show our users.

I'm trying to figure out how to enforce the default association for the mailto: protocol.
This article is obsolete as it doesn't work: https://support.microsoft.com/en-us/help/2008044/how-to-configure-the-default-e-mail-client-using-group-policy
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Cliff GaliherCommented:
Which is why I didn't suggest that. I suggested removing the mail app in an orchestrated way. It can't be a default app of it doesn't exist.
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