Yes. Documents created in Office 2000 applications can be read and edited in Office 2003. Documents created in Office 2003 can be read, but cannot be edited unless saved in a format compatible with Office 2000.
Yes.but Microsoft Office 2007 is not
Yes, Microsoft Office 2003 is compatible with Windows Vista.
Yes, Microsoft Office 2003 is compatible with Windows 7.
Yes, Ms office 2003 is backward compatible with MS Office 2000. But if you are an advance user who programs in MS Office 2003. than there is certain part of code written in Ms office 2003 does not work in 2000. That's very minimal.
No, Office XP was the last version which could be installed on Windows 98/Me. Office 2003 requires Windows 2000 or a later OS.
Yes. You must have service pack 3 or later installed, however.
Yes, Microsoft Office 2003 is compatible with Windows 7.
Yes.
Sure. Even MS Office XP and MS Office 2003.
Yes, according to: support.microsoft.com/kb/822129
It is compatible. It only depends what type of file you save it as. If you are still having incompatibility problems, download the Compatibility Pack for Microsoft Office 2007 form Microsoft Downloads.
No. There was Office 2000, Office 97 and Office 95, Office 4.x, Office 3.0 and before that it was just Microsoft Office, launched in 1989.