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You can save the file you're working on, whether it's new or has been saved before, and you can also save a copy of the file with a different name or in a different location. You can save any file as a Single File Web Page (MHTML) so that it can be viewed and used on the Internet.
When you open the Open and Save As dialog boxes after starting a Microsoft Office program, the My Documents folder appears by default. The My Documents folder is a good place to save files you're working on, such as documents, worksheets, or databases.
My Network Places, which is located on the My Places bar in the Open and Save As dialog boxes, is a good place to save files you want to copy or publish to folders on network file servers or Web servers. Saving files to a server allows others easy access to them.
The difference between a fast save and a full save
With a fast save, your Microsoft Office program saves only the changes to a file. Saving only the changes takes less time than a full save, in which the complete, revised file is saved. A full save, however, requires less disk space than a fast save. You should do a full save when you finish working in a file and save it for the last time. Save Options are available in the Save As dialog (Tools menu) that allow you to enable or disable fast saves, as well as select other options.
Note The Allow fast saves option is only available for Microsoft Word and Microsoft PowerPoint.