I recently upgraded from Office 2010 to Office 365. But now I have problems with all of my excel spreadsheets which were done in Office 2010. My biggest problem is that not all of the data has pulled through - only some cells still calculate correctly, others does nothing at all. So needless to say that all of my totals are also now incorrect. Autosum also does not work, it does not calculate the cells which I ask it to calculate.