Those are intended more for creating virtual environments for cross platform like seeing Linux load and run while still being booted in Windows. Those also tend to allow things like running Mac apps on Windows or vice versa and may not work for simply seeing older MS apps work since you still need to see them installed.
Vista like XP is still backward compatible while the XP Pro 64bit edition was an unsupported flop due to no 3rd party support just barely now being seen with the 64bit editions of Vista. I'm glad I didn't spend the $50 for an XP 64bit oem disk seen last year and simply went with Vista as at first a second OS as the new one out.
Desktop apps suffer the most when any new version comes out often seeing a need for the next version made for the new one. Others written specific for one version alone suffer the most since some of the older versions may still see installation on a newer version out like Vista but need to run in the compatibility mode setting. At least those install while XP only? ut oh!
Vista like XP is still backward compatible while the XP Pro 64bit edition was an unsupported flop due to no 3rd party support just barely now being seen with the 64bit editions of Vista. I'm glad I didn't spend the $50 for an XP 64bit oem disk seen last year and simply went with Vista as at first a second OS as the new one out.
Desktop apps suffer the most when any new version comes out often seeing a need for the next version made for the new one. Others written specific for one version alone suffer the most since some of the older versions may still see installation on a newer version out like Vista but need to run in the compatibility mode setting. At least those install while XP only? ut oh!