I had a boss who asked me about a similar thing, their computer was going slow. I saw them checking their email by booting up their (quite old) Mac, launching a VM which loaded a full Windows installation, then opening Outlook inside Windows. I asked about it, and apparently they used to have a PC and Outlook set up for their email, then at some point had switched to Mac and somehow landed on that as the solution. I told them you can just install Outlook directly onto the Mac and they said I was being unhelpful lol.