"Go-oo has built in OpenXML import filters and it will import your Microsoft Works files. Compared with up-stream OO.o, it has better Microsoft binary file support (with eg. fields support), and it will import WordPerfect graphics beautifully. If you are reliant on Excel VBA macros - then Go-oo offers the best macro fidelity too. If you expect your spreadsheets to calculate compatibly, or you get embedded Visio diagrams in your documents, you'll want Go-oo. " - Edmund Tay