For the majority of Word documents out there TextEdit will open them just fine. In fact the majority of Word documents should never have been saved as Word documents, but should have been saved as RTF files (that everything under the sun can read, rather than "requiring" a $300 piece of software). The really complex ones (charts, excel tables, stuff with ActiveX), or documents that use complex tables or the versioning system will not open right, but how often do you see that?