I want to do a dual boot windows 7 ( oem installed ) and xp , can the xp be on extended partition?
If it is possible to do this after converting the hard disk to a dynamic disk?
You can, But XP will over write the bootsector. I am not sure on how to restore the Win7 boot files, Otherwise only XP will load. It works best if you install XP first then install Win7 second.
Always install the oldest OS first when you want to configure a multi boot system