What is the real difference between a .xls vs .xlsx file ?

Hi ...  Can somebody point me to a credible source of information explaining what are the real differences between a .xls and .xlsx file ?  I have many .xls file.  I began using Office v14 recently and wonder if it is useful to change them all to .xlsx instead of still saving them to .xls format.

What will I be loosing or missing ?  
 

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Last updated July 31, 2019 Views 102,587 Applies to:
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Take a look at the "Benefits of the New File Formats" section here:


If none of the benefits are things you're interested in, there's no reason to change.

In general, .xlsx/.xlsm files are somewhat less likely to become corrupt, and can be smaller, but if you make regular backups and have plenty of disk space, there's no reason to spend the time converting.

OTOH, there's usually no reason not to take advantage of the OOXML formats for new files that you create.

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Read the information at this link: http://www.differencebetween.net/technology/difference-between-xls-and-xlsx/

Although geared to windows version the information appears to apply to the Mac versions as well except for the office package versions  2003 (as opposed to 2004) and so on.
If my reply has helped, mark accordingly - Helpful or Answer
Phillip M. Jones, C.E.T.

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