I use Leopard and mac excel 2008 and the rest of the people at my work use office 2003 for PC. We are having compatibility issues even when I send files to my boss who uses Office 07 on PC. We have tried saving as workbook 1997-2004 windows files, I have saved it as a .docx and sent it to him and he converts it to .doc (2003) and it still is having major formatting problems. When I try and convert it to PC 1997-2004 workbook, it tells me "No more new fonts may be added to workbook" then it says "document was not saved" so it forces me to save it as .docx.....I have all the updated patches and whatnot for office 08 and nothing is solving this problem... If anyone has a reasonable solution to what we can do, please let me know!