Unlike WinWord, there is no extra proofing tools CD that you can buy for
MacWord. All versions come with all languages that are available. I don't
think Polish is among them, so you will have to go to third-party tools (I'm
pretty sure I installed all available languages and don't see it on my
installation).
I think you can try CocoAspell for spelling--at least, that's the tool I've
heard of. There may be others, try searching the web. I'm not sure about
grammar check. Others have suggested pasting into TextEdit to use the
spellchecking there. If you search the archives of this newsgroup, you'll
find suggestions for various languages.
http://groups.google.com/group/microsoft.public.mac.office.word
Also, look for a internet community of Polish-speaking Mac users. They might
know of locally produced supplements to Word.
If you want definitions, you definitely need a third-party solution for all
languages other than English.
