You have to take care of it yourself.

John Walkenbach shares this:
http://www.j-walk.com/ss/excel/tips/tip23.htm

John Davies wrote:

The undo facility does not work and I presume that some macros that I am
using on the sheet are clearing the undo list (even though I have not
specifically set up any macros to do this). Is there a way to prevent these
macros from doing this as it is very irritating

Thanks in advance for any help

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Dave Peterson