Try fmstrat/winapps it’s installation process is well documented and it works relatively well. In case you don’t need too much functionality (e.g. complex formatting/custom template/a ton of custom add-ons) the online version might work for you. There’s also a web app for teams you can find on flathub iirc. Betterbird also gives you a ton of options and with owl addin it handles exchange pretty well and also gives you access to the teams web app directly inside betterbird