Different office version

ta5

Hi
I known, will have to conduct some more tests, but maybe someone can give me an advice before...
How is the compatiblity between different word versions regarding automation?

Examples:
Development machine: Word2000, Customer machine: Word2007
Development machine: Word2003, Customer machine: Word2007
...and so on

Maybe it would be useful to distinguish between the versions to have a kind of crossversion functionality in a multi version environment?

Thanks in advance
Thomas