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I have Thunderbird and now Outlook-365 on my system. I would like to change my default E-Mail App to Outlook.

  • When you select "send to - Mail recipient" Outlook should open
  • When you select from Excel - Share - Attach as a copy, the Excel should be sent with Outlook

I am on Windows 10 20H2 and Outlook 365.

Of course the defaults have been set:

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I also tried to change the "send to" to Outlook, but Windows says, the app is

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When I explicitly try to select C:\Program Files (x86)\Microsoft Office\root\Office16\outlook.exe I get:

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I also deleted all entries named "mailTo" in the registry.

Still everything is routed to Thunderbird.

I am out of ideas.

So, how do I change it?

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  • May I know if you set Outlook as the default mail client via Outlook options?
    – Sunny
    Nov 3, 2020 at 9:40
  • I did, though I think it has no effect in Windows 10. I also disabled default in Thunderbird.
    – Gunnar Bernstein
    Nov 4, 2020 at 16:18
  • Finally figured it out: Reset to Microsoft defaults. Strangely switching E-Mail default apps did not do anything.
    – Gunnar Bernstein
    Apr 22, 2022 at 11:21

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Reset to default

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