So I was working on a PowerPoint presentation that had a table on one slide. I needed to edit the original spreadsheet, but I had no working document of the original Excel file. So I right click the table, go to Worksheet Object and ask Microsoft to convert the table for me so I can work with it. The above dialogue box comes up. Take a second to read it all. "The selected Microsoft Office Excel Worksheet object will not be converted." Thanks for nothing, Microsoft. It may have made more sense if you never let me even think I could convert this in the first place. (Solution, in case this ever happens to anyone else out there: Right click the table >> Worksheet Object >> Open . Once it opens in Excel, File >> Save A Copy . Do what you have to do, and then Copy >> Paste back into PowerPoint.)