I own a Pro License for v8.
I would very much like to see a Linux version (KDE Plasma/Qt) of eM Client, I would be willing to re-purchase a license if it was required. As others have said this is the best email client anywhere and it pains me not to be able to use it now that I use Linux as a daily driver.
Getting eM Client to run using wine has always been difficult to the point of impossible due to some very funky .Net requirements. I have not yet tested v9 on wine to see if some of these outdated requirements have finally been dropped.
If not a proper Linux client please at least migrate legacy code to .Net Core to improve the odds of running on Linux with tools like Wine.
Evolution currently remains the best/nearest option on Linux, although visually it’s far behind eM.
It isn’t too bad though and continues to see improvements, at least on Arch. Debian based distros may only be packaging old versions.