I would never have expected to see an error message like this one, until I recieved an email from a customer on our support line who mensioned that they have a spreadsheet with this error prompt. The customer said that the worksheet was not TOO big, but was growing in size....until this error appeared.

I wonder what the sheet looked like if it had about 4000 different formatting styles on it! Phew...it must have been quite a work of art!

See this link: "Too many different cell formats" Error for an explaination of the problem and some tips to help solve the problem IF it were to happen to you!