Hello - I had a worksheet that was
- created in Excel 2007 (had ~320 columns)
- opened, edited & saved in Excel 2003 (lost columns, now only showing 256)
- re-opened in 2007, saved in 2007 as an .xlsx file.
I need to add the additional columns into the 2007 file now (>256). It's giving me errors. How do I add more columns?