You have too many cell formats.

See this KB Article for explanation and fixes.

http://support.microsoft.com/default...b;en-us;213904


Gord Dibben MS Excel MVP

On Mon, 8 Mar 2010 14:05:01 -0800, edwin_dammam
wrote:

when pressing the enter key after formating a cell in excel 2003 file, a
window message will say "to many different cell format". If I press OK, and
later save the file, the other previous formatting will be gone once I opened
the same file.