So far so good. I have been using the open source equivalent of Excel: 'Calc'. I have used it to update a rather complex financial model originally built in Excel. This workbook has several inter-related spreadsheets and complex calculations. I put some care into the layout. I've also used some more advanced features such as conditional formatting and I have several charts. The workbook was created in Excel 2007 and saved down to Excel 97-2003 format.
In Calc, the document opens and displays fine. Even the conditional formatting survives. Some of the charts are formatted awkwardly but they are still meaningful. Editing and updating the file went very well. Menus and buttons work almost exactly the same way as in Excel 2003.
Once my changes were made, I was able to save the file back to the Excel 97-2003 format. When I shared the file, it opened and displayed without any problems on Excel 2003 and on Excel 2000. However - and this is a big catch - when I opened the file in Excel 2007, it did not go so well. I got this message:
(It says: "Excel found unreadable content in [file name]. Do you want to recover the contents of this Workbook? If you trust the source of this workbook, click Yes.")
After clicking yes, the file opens but all of the formatting has been lost and the charts have disappeared!
Interesting… If OpenOffice is able to save a file that can be opened in Excel 2000 and Excel 2003 why would this compatibility not work in the 2007 version? You do not have to be a conspiracy theorist to see that it is not in Microsoft's interest in to allow OpenOffice to freely exchange data with MS Office products. So for the time being if you need to open an OpenOffice in Excel 2007, you will have to open it in an earlier version of Excel first, save it and then open it in Excel 2007!



