On monday February 27th, 2023 the AN-225 will be released for the PC.
In case someone (who bought the sim in the MS marketplace(!)) buys it tomorrow and then have it on PC, will he get it automatically on the XBox as well when it is released for XBox?
You won’t have to buy it twice if you buy it on the Marketplace, because every purchase there is cross-platform between PC and Xbox. As soon as the Xbox version becomes available, it will be downloadable to your console. It’s the same piece of content so it wouldn’t even be technically possible to buy it twice.