HI guys Do you guys experienced this kind of problem? When i finished my excel sheet at home, the format for cells are right. However, when i got to the office and open it for my boss, the cell format changed by itself. For example, cell A is set for number only, but when i open it at my office, the format of the cell change to some letters. Oh, my office use Ms office business version and my home use professional version. Could that cause the problem? Thank you very much for helping .