I've upgraded one of my people to Office 2003 as my test case - so far everything is great with the exception of subtotals...after four or more subtotals deep the calculations do not occur correctly... the same exact file can be saved, then subtotals can be calculated in Office XP with no issue. I've worked with him and tested it on multiple files with the same results. He has the latest Office 2003 updates and has all of the same options enabled within Excel. Any help would be greatly appreciated...