Shared file saving problem

[hunsnowboarder]

Hi Everyone. I have the following problem. We have Excel 2003 at our workplace. I have shared a file, which is used by many users, so we can use the file at the same time. My problem is that if let's say I am writing a value in cell C2 and another user uses the same cell and writes another value there, and he saves the file and then I try to save the file as well, Excel will ask me which value to keep (the value written by the other user, or my value). Actually what I would need Excel to do is to save both, and put one under the other. Is that possible somehow?
Thank you in advance!