Microsoft Office calls the wrong email client

[StuartTeo]

I'm doing this (the below) from within MS Office 365. It doesn't matter if it is Word, Excel, or Powerpoint.


I'm trying to send a DOCX file as an attachment. However, Word calls Thunderbird instead of Outlook. My Win10 has set Outlook as the default mail client. I've also looked at Outlook itself and set Outlook to be the default app for everything it can handle. Below is how my Thunderbird settings look like:




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