Soo, I gave it a try and guess what? MS Office artifacts are still there, with freerdp it is even worse than with native seamless mode. Apparently (even if I check "turn hardware graphics acceleration off") Office uses some obscure DirectX calls that translate to X11 in very unpleasant way that is very unfriendly to window decorator metrics, sloppy focus and virtual desktops. I remember I had similar problems with Wine/Crossover as well.
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