You can change the level of undo's in Excel:

xl2k and above
XL: How to Modify the Number of Undo Levels
http://support.microsoft.com/?kbid=211922

xl97
XL97: How to Modify the Number of Undo Levels
http://support.microsoft.com/?kbid=162944

You may have to change the number in that key to match your version of excel.

NickiNeedsHelp wrote:

Any way to increase the amount of Undo/redo action to be more that 16 times?

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Dave Peterson