Actually, I am bumping into the same problem Houscous did in this thread, except I find that even Linux needs at least one primary partition. I only get 4 partition entries in the MBR. So I can have 4 primaries. Or I can have 3 primaries and one chain of logicals. I really need the second setup so I am limited to only 3 OS's. Sorry, BSD. I will pick XP, Solaris 10, and a Linux. I haven't completely given up yet. But installing into primaries and copying into logical partitions didn't work. I tried to trick BSD into installing in a logical partition. It simply reused the first partition entry in the MBR 
Good thing I had a premade rescue cd. I have a few more tricks to try, but I'm losing hope of having all the OS's I want.