I was thinking this was the cohabitation between Mac and Mac Power PC, allowing some series to run MS on a Mac, which is more than likely why it fell to the wayside.
Dual boot, no. However, to say, one wanted to try Linux on a MS host, then one would use the "Live" CD for a trial run. As mentioned, this would allow the host hardware to be accessed by Linux to "see": 1. If it would work on the rig. 2. To give the user an idea of what a Linux OS could do.
I did dual boot back in the day, and on a 120GB drive, found WinXP SP2 was a resource hog, and relished it's extra "space" on a HD. However, those days are long gone.
Get yourself a CD from here, and give it a shot.
https://shipit.ubuntu.com/