There are lots of ways:
Click on the disk icon.
Press Ctrl - S
Press Alt - F - S
Press Shift - F12
From within Excel, File Menu>Save As>Save As Type>CSV
You can open a 2007 Excel spreadsheet with Excel 2003 if you save the file in Excel 2007 using "Save As" and select the 2003 compatibility mode.
In XLS 2003 you can simply turn the "Save AutoRecovery info" in EXCEL (Tools/Options/Save)
Save your file as Excel xls format. Use the File-->Save As... menu and select the file type in the save dialog. For a video How to, see related links.
You don't. "Auto" means automatic - Excel does it for you.
Open in Excel and save as an Excel Template.
When you come to save your spreadsheet - use 'Save as' instead of save, and select the correct excel version from the drop-down menu.
A spreadsheet that you create and save with Excel is an example of a file.
save
don't
The way Microsoft designed Excel, the program has the ability to save files in HTML format. You just click the Save As option and select .html. MS Excel automatically creates the appropriate HTML code for you.
open file in excel 2007 then press ribbon and go to Save as, you will see Excel 1997-2003 Workbook option, click on it and save file.