In one of yuor (many)articles, "NTFS or FAT32: Which Should I Choose?", reads ...(

....You will also want to use FAT32 when you have multiple operating systems on one computer...
Is that ture?
I mean, I have Window 7 as a "main" OS on the PC, and because I am preparing myself for the CompTIA A+ I need and decided to install Windows 2000, XP and Vista.
Is a requeriment to have FAT32 as a file system, should I give up my folder security and somethings more?
Pleas, help on this.
Ricardo