使用C＃和Excel 2007互操作创建工作簿

i'm curently using Excel 2003 to generate reports, but i'm thinking of migrating to Excel 2007. The problem is that some of my users still have Excel 2003 installed on their PCs, so I'll give them the posibility to choose what to generate - Excel 2007 or Excel 2003 compatible report. So my i'm curently using Excel 2003 to generate repor