I have a MacBook pro running MacOS 10.15.7. I installed windows 10 on a Parallels virtual machine. My emails on my primary email program on the Catalina partition are gone.
That is a strange issue that I have never come across. There should be any interaction of that type between Windows in a Parallels virtual machine and your User folder/Mail application.
Do you have a Time Machine or other backup of your data?
Is your email only stored locally on your Mac, or can you access it via webmail in a web browser?
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