Have a Mac using Snow Leopard purchased early 2010. Purchased Office Suite 2008 for Mac. Have been using it without issues until recently. When doing a sort in Excel have started getting a message "This operation requires the merged cells to be identically sized". Have tried repeatedly. Have not changed the format when adding data, have not asked for cells to be merged. Have tried copying to a new file. It will sort a small selection from the data base but not the whole or major part of it. (240 rows 13 columns). I thought to myself - try reinstalling the Office discs - but that stalls because it tells me that there is a more up to date version already installed - I guess because of online updates. Where to from here please? I am not an expert but am beyond the raw beginner stage. Jennifer