Save Microsoft Word 2007 documents to your computer, and learn the difference between the Save and Save As commands.
Sometimes you may need to work with documents that were created in earlier versions of Microsoft Word, such as Word 2003 or Word 2000. When you open these types of documents, they will appear in Compatibility mode.
Compatibility mode disables certain features, so you'll only be able to access commands found in the program that was used to create the document. For example, if you open a document created in Word 2003, you can only use tabs and commands found in Word 2003.
If you want access to all of the Word 2007 features, you can save the document in the Word 2007 file format.