Which software RAID format does that Windows use? IME, both software and fakeRAID's (and hwRAID's too) do store array metadata into the disks. One format's metadata overwriting another format's is a horror scenario.
Furthermore, your current Windows would be confused on deciding whether to activate the "software" or the "BIOS" array, unless you convert it from its current format to the fakeRAID format.
I do not say that such mix are impossible, but I would not try without proper backup.
What would be the other OS? And which RAID mode is in use now?
(Not to mention: Have you just hijacked a thread of somebody else?)