Hopefully it would work out better than in Munich.
Munich was pretty good. It's been deployed for 4+ years and won't be replaced until the end of 2020 (assuming everything goes to plan) so that will be at least 7 years of use. It seems that the reasons to move back to Windows weren't completely technical either.
Munich never switched off Windows and MSFT Office at best it just abstracted or added additional layers of complexity.
The moment you need to digitally sign some stupid PDF with some “proprietary” signature scheme or open some excel spread sheet it’s pretty much back to Windows.