Beta or prerelease software is not intended for inexperienced users, as the software may contain bugs or potentially damage your system. We strongly recommend that users exercise caution and save all mission-critical data before installing and/or using this software.
Working together with Windows users shouldn't be problematic at all. Still, some email messages can not be natively read by the Mac and are packed into Winmail.dat files that have to be extracted and displayed somehow. If winmail.dat files are a reoccurring problem, Letter Opener for macOS Mail is the solution. Installed into Mail it opens and displays the files directly inside Apple's Mail application, so that they appear just like any other email. Forget about winmail.dat files entirely.