Teachers should really give OpenOffice.org a look: Office XP compatible, lots of extra features, Mac/Win/Linux variants, and PDF export functions. It is also multi-lingual, multi-system, and uses openly accepted formats.
It is a highly suitable tool for Teachers everywhere and well worth the download from OpenOffice.
Its website says: "Oo is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute." Download